Abstract: A vacuum pump includes: a casing formed with an inlet port or outlet port; a stator disposed inside the casing; and a rotor enclosed in the casing and including a shaft rotatably supported on the stator, and a rotor blade formed in a cylindrical shape with a plurality of blades arranged in multiple stages on an outer circumferential portion thereof, and secured to the shaft such as to be integrally rotatable therewith. The rotor blade is provided with a rupture location control groove as a rupture location control means that locally reduces rigidity of the rotor blade to control a location where the rotor blade ruptures.

Abstract: A vacuum pump includes a linked-type thread-groove spacer which is a structure for linking a Siegbahn pump portion and a thread-groove pump portion, and when an outlet position of a thread groove which is an exhaust channel portion of this linked-type thread-groove spacer is in a vicinity of the stator portion (stator bolt) of the stator column, conductance of the exhaust channel is lowered. Thus, phases in a circumferential direction of installation positions of a thread ridge of the linked-type thread-groove spacer and the stator portion of the stator column are aligned as much as possible. In other words, the thread groove of the linked-type thread-groove spacer which is the exhaust channel is provided between the installation positions of the stator portions in the circumferential direction of the stator column so that lowering of the conductance of the exhaust channel is suppressed.

Abstract: A vacuum pump includes a linked-type thread-groove spacer which is a structure for linking a Siegbahn pump portion and a thread-groove pump portion, and when an outlet position of a thread groove which is an exhaust channel portion of this linked-type thread-groove spacer is in a vicinity of the stator portion (stator bolt) of the stator column, conductance of the exhaust channel is lowered. Thus, phases in a circumferential direction of installation positions of a thread ridge of the linked-type thread-groove spacer and the stator portion of the stator column are aligned as much as possible. In other words, the thread groove of the linked-type thread-groove spacer which is the exhaust channel is provided between the installation positions of the stator portions in the circumferential direction of the stator column so that lowering of the conductance of the exhaust channel is suppressed.

Abstract: A vacuum pump includes: a casing formed with an inlet port or outlet port; a stator disposed inside the casing; and a rotor enclosed in the casing and including a shaft rotatably supported on the stator, and a rotor blade formed in a cylindrical shape with a plurality of blades arranged in multiple stages on an outer circumferential portion thereof, and secured to the shaft such as to be integrally rotatable therewith. The rotor blade is provided with a rupture location control groove as a rupture location control means that locally reduces rigidity of the rotor blade to control a location where the rotor blade ruptures.

Abstract: An emulsified composition for hair, which contains a nonionic surfactant that is a solid at normal temperature and has a Krafft point of at least 40° C., an oil component, and water, and which has an average emulsified particle size of 0.5 ?m or less, provides long-lasting luster. Further, an emulsified composition for hair, which is an water-in-oil emulsified composition and which contains the following two types of oil phase as the oil phase, improves the feel of hair immediately after use: 1) an oil phase with an average particle size of 0.5 ?m or less, formed with a nonionic surfactant that is a solid at normal temperature and has a Krafft point of at least 40° C., and 2) an oil phase with an average particle size of 0.5 to 100 ?m, formed with a surfactant and/or an alkyl-modified carboxyvinyl polymer.

Abstract: An emulsified composition for hair, which contains a nonionic surfactant that is a solid at normal temperature and has a Krafft point of at least 40° C., an oil component, and water, and which has an average emulsified particle size of 0.5 ?m or less, provides long-lasting luster. Further, an emulsified composition for hair, which is an water-in-oil emulsified composition and which contains the following two types of oil phase as the oil phase, improves the feel of hair immediately after use: 1) an oil phase with an average particle size of 0.5 ?m or less, formed with a nonionic surfactant that is a solid at normal temperature and has a Krafft point of at least 40° C., and 2) an oil phase with an average particle size of 0.5 to 100 ?m, formed with a surfactant and/or an alkyl-modified carboxyvinyl polymer.

Abstract: A hair revitalizing composition containing as effective ingredients amine oxide compounds, in which at least two said amine oxide compounds having mutually different chain lengths are combined; a method of revitalizing hair of mammals with such a hair revitalizing composition; or use of the above compounds for preparation of the above combined hair revitalizing composition. The above composition exhibits a synergistic hair revitalizing effect, compared with cases where the two amine oxides are used independently.