Abstract: The present invention provides a martensitic heat resistant alloy having a composition (A) comprising, % by weight: 0.03 to 0.15% of C; 0.01 to 0.9% of Si: 0.01 to 1.5% of Mn; 8.0 to 13.0% of Cr; 0.0005 to 0.015% of Al; no more than 2.0% of Mo; no more than 4.0% of W; 0.05 to 0.5% of V; 0.01 to 0.2% of Nb; 0.1 to 5.0% of Co; 0.008 to 0.03% of B; less than 0.005% of N: and Fe and inevitable impurities as the remainder, wherein (B) the contents (% by weight) of Mo, W, B and N satisfy the following formulae (1) and (2). B?0.772N>0.007??(1) W+1.916Mo?16.99B>2.0??(2) The martensitic heat resistant alloy of the present invention has excellent oxidation resistance, hot workability and ductility and exhibits high creep rupture strength in a range of relatively long rupture time at a high temperature.

Abstract: A high reliability emission source is constructed to secure the ohmic contact between a carbon nanotube and an electrically conductive base material, so as to ensure sufficient joining strength, and to provide for easy beam shaft adjustment. An electron microscope for realizing high resolution, high brightness, a reduction in sample damage due to a reduction in acceleration voltage, a reduction in cost and compactness, and an electron beam drawing device for realizing high definition, high efficiency, a reduction in cost and compactness in comparison with the conventional device, is achieved by using this high reliability emission source. In the emission source, the carbon nanotube is attached to the tip central portion of the electrically conductive base material through an electrically conductive joining material or an organic material by carbonization-processing the organic material by heat treatment, or by diffusive joining.

Abstract: The disclosure is concerned with an electron microscope comprising a casing for encasing an assembly and a display disposed to the casing. The assembly comprises a vacuum container, a vacuum pump for evacuating the vacuum container, an electron emitter disposed at the upper position of the vacuum vessel, a sample chamber disposed at the lower position of the vacuum container and capable of projecting from the casing and a detector for detecting an electron beam emitted from a sample placed in the sample chamber.

Abstract: The disclosure is concerned with an electron microscope comprising a casing for encasing an assembly and a display disposed to the casing. The assembly comprises a vacuum container, a vacuum pump for evacuating the vacuum container, an electron emitter disposed at the upper position of the vacuum vessel, a sample chamber disposed at the lower position of the vacuum container and capable of projecting from the casing and a detector for detecting an electron beam emitted from a sample placed in the sample chamber.

Abstract: The present invention provides a martensitic heat resistant alloy having a composition (A) comprising, % by weight: 0.03 to O.15% of C; 0.01 to 0.9% of Si: 0.01 to 1.5% of Mn; 8.0 to 13.0% of Cr; 0.0005 to 0.015% of Al; ;no more than 2.0% of Mo; no more than 4.0% of W; 0.05 to 0.5% of V; 0.01 to 0.2% of Nb; 0.1 to 5.0% of Co; 0.O08 to 0.03% of B; less than 0.005% of N: and Fe and inevitable impurities as the remainder, wherein (B) the contents (% by weight) of Mo, W, B and N satisfy the following formulae (1) and (2).

Abstract: The invention provides a high reliability emission source able to secure the ohmic contact of a carbon nanotube and an electrically conductive base material, and having sufficient joining strength and easily making a beam shaft adjustment. The invention also provides an electron microscope for realizing high resolution, high brightness, a reduction in sample damage due to a reduction in acceleration voltage, a reduction in cost and compactness, and an electron beam drawing device for realizing high definition, high efficiency, a reduction in cost and compactness in comparison with the conventional device kind by using this high reliability emission source. Therefore, in the emission source, the carbon nanotube is attached to the tip central portion of the electrically conductive base material through an electrically conductive joining material or an organic material.

Abstract: The disclosed electrode composition for a vacuum switch comprises copper, as a principal ingredient, a low melting point metal such as Bi, Pb, In, Li, Sn or any of their alloys, in a content not exceeding 20% by weight, a first additional metal such as Te, Sb, La, Mg or any of their alloys and a refractory metal such as Cr, Fe, Co, Ni, Ti, W or any of their alloys in a content less than 40% by weight.

Abstract: The disclosed electrode composition for a vacuum switch comprises copper, as a principal ingredient, a low melting point metal such as Bi, Pb, In, Li, Sn or any of their alloys, in a content not exceeding 20% by weight, a first additional metal such as Te, Sb, La, Mg or any of their alloys and a refractory metal such as Cr, Fe, Co, Ni, Ti, W or any of their alloys in a content less than 40% by weight.

Abstract: A contact for a vacuum circuit breaker is disclosed which contains copper as a first component and also at least two elements of the group of chromium, molybdenum, and tungsten as the other components. Each of these other components is contained in an amount not greater than 40% by weight.

Abstract: A vacuum type circuit breaker which has an operating lever (31) connected at one end thereof to the movable electrode (102) of a vacuum switch tube (1) and at the other end to a closing spring (55) through an energy storage link mechanism (54). The operating lever (31) functions to drive the movable electrode (102). The energy storage link mechanism (54) is provided with an energy storage crank (52) pivotally supported on a shaft (2051). The force which the energy storage link mechanism (54) applies to the operating lever (31) is set such that it is less than a force on the operating lever (31) which is produced by the difference between the internal pressure of the vacuum switch tube (1) and atmospheric pressure. This arrangement makes it possible, upon occurrence of vacuum loss, to detect the vacuum shortage, whereupon the closing of the switch is prevented to thereby avoid an accident due to vacuum degradation.

Abstract: A contact for a vacuum interrupter has excellent characteristics of high withstand voltage, low melt bonding property, large current durability and low chopping current and is prepared by uniformly distributing, in a copper matrix, two kinds of high melting point metal powders having a melting point of higher than 1450.degree. C. which have different particle diameters of (1) 80-300 .mu.m and (2) less than 30 .mu.m. The low chopping current characteristic is imparted by incorporating more than 10 wt. % of the high melting point metal powder. The high melting point metal powder can be selected from the group consisting of Cr, W, Mo, Ir and Co.

Abstract: A contact for a vacuum interrupter has excellent characteristics of high withstand voltage, large current durability and low chopping current and is prepared by infiltrating copper into a skeleton obtained by sintering a specific tungsten powder having an average diameter of less than 1 .mu.m.The skeleton is preferably prepared by a vacuum sintering process and the copper is infiltrating into the skeleton in hydrogen atmosphere or in vacuum.

Abstract: A circuit breaker includes a lever which is connected to a spring mechanism at one point between both ends of the lever; a movable contact connected to one end of the lever; a stationary contact placed to face the movable contact; a fitting mechanism which is formed on the lever at a position of the movable contact side from the position connecting to the spring mechanism; and a ratchet mechanism which fits to the fitting mechanism so as to fit said lever at the position when the other end of the lever is shifted to a predetermined position against the force actuating the spring mechanism.