摘要:
The characteristics of thin-film magnetic heads are evaluated by measuring, in a step and repeat method and apparatus, the magnetic field generated by the respective heads in a bar including multiple heads.
摘要:
The characteristics of thin-film magnetic heads are evaluated by measuring, in a step and repeat method and apparatus, the magnetic field generated by the respective heads in a bar including multiple heads.
摘要:
Technology is provided for changing a mounting angle of a component to reduce the amount of relative displacement between a mounting head and a board. A component, for which a mounting angle can be changed, is specified based on information stored in a mounting data storage area and a component data storage area according to a predetermined component mounting order. A mounting time in a mounting path with the mounting angle of the specified component being changed is calculated for each mounting angle to specify the mounting path requiring the shortest mounting time.
摘要:
This invention is directed to the prevention of the deterioration of the accuracy in component mounting by suppressing the temperature rise of the moving member as much as possible by cooling the moving member, which is the heat source of a linear motor. The moving member 48 of the linear motor 14 is configured in the following manner for achieving the objective of this invention. That is, the heat dissipation portion, the axis 17 made of the material with efficient thermal conduction such as aluminum, pierces through the iron core 18 around which coils 20 are wound. The moving member except a part of the axis 17 is molded with synthetic resin, and at one end of the axis 17, the heat dissipation fin 19 which makes heat dissipation area larger is formed. And this heat dissipation fin 19 is placed to face the air exhaust port 67. By configuring the moving member in aforementioned manner, the temperature rise is suppressed even if the coils 20 generate heat, because the heat in the coils 20 is transmitted to the iron core 18 and then to the axis 17 and dissipated through the heat dissipation fin 19. The heat in the outermost part of the iron core 18 from the heat dissipation fin 19 is also transmitted to the heat dissipation fin 19 through the axis 17 resulting in the suppression of the temperature rise of the moving member as a whole.
摘要:
An object of the present invention is to provide a composition for removing aldehyde. Specifically, the present invention relates to an aldehyde-removing composition comprising a microorganism belonging to the genus Gluconobacter having aldehyde-degrading activity, or extracts thereof or disrupted cells thereof, wherein the microorganism belonging to the genus Gluconobacter has higher aldehyde-degrading activity than aldehyde-generating activity.
摘要:
When manufacturing an optical recording medium by forming a resin layer on a surface of a substrate and then forming a center hole that passes through the substrate and the resin layer, a method of manufacturing an optical recording medium according to the present invention forms the center hole by forming, in the resin layer, a circular cut with a larger diameter than the center hole so as to surround a formation position of the center hole and then pressing in a punching blade for forming the center hole from a rear surface side of the substrate. By doing so, detachment of the resin layer and the production of burrs at or near the center hole can be avoided while reducing the manufacturing cost.
摘要:
The invention is directed to reduction of torque by reduction of an outside diameter of a mounting head. A cylindrical cam rotation motor is provided under a nozzle rotation motor. A first rotation axis member as a rotor of the nozzle rotation motor is provided along an axis line of a nozzle holder and penetrates into the nozzle rotation motor and the cylindrical cam rotation motor. A second rotation axis member as a rotor of the cylindrical cam rotation motor is provided along an axis line of a cylindrical cam member and penetrates into the cylindrical cam rotation motor. A suction nozzle to be used protrudes from a lower end surface of the nozzle holder at a protrusion position.
摘要:
The present invention provides a ceramic circuit board comprising: a ceramic substrate and a metal circuit portion bonded to at least one main surface of the ceramic substrate; wherein each of ratios of Ra1/Ra2 and Ra2/Ra1 is 1.5 or less in which a surface roughness in terms of arithmetical average surface roughness Ra in arbitral one direction of the ceramic substrate is Ra1 while a surface roughness Ra in a direction normal to the one direction of the ceramic substrate is Ra2, and a breakdown voltage of the ceramic substrate is 20 kV/mm or more. According to the above structure of the present invention, there can be provided a ceramic circuit board having an excellent heat-cycle resistance and bending strength characteristics without impairing a heat radiating property, and capable of increasing an operating reliability as electronic device.
摘要:
The present invention provides an aluminum nitride substrate and an aluminum nitride circuit board having excellent insulation characteristics and heat dissipation properties and having high strength, a semiconductor apparatus, and a method for manufacturing an aluminum nitride substrate.An aluminum nitride substrate according to the present invention is an aluminum nitride substrate having aluminum nitride as a main component and comprising a polycrystal containing a plurality of aluminum nitride grains, and complex oxide grains being present at grain boundaries of the aluminum nitride grains and including a rare earth element and aluminum, wherein the aluminum nitride grains have a maximum grain size of 10 μm or less, the complex oxide grains have a maximum grain size smaller than the maximum grain size of the aluminum nitride grains, the number of the complex oxide grains having a grain size of 1 μm or more being present in a field of view of 100 μm×100 μm of a surface of the aluminum nitride substrate observed is 40 or more, the aluminum nitride substrate has a bending strength of 400 MPa or more in an unpolished state after firing, and the aluminum nitride substrate has a volume resistivity of 1012 Ωm or more.
摘要:
The present invention provides an aluminum nitride substrate and an aluminum nitride circuit board having excellent insulation characteristics and heat dissipation properties and having high strength, a semiconductor apparatus, and a method for manufacturing an aluminum nitride substrate.An aluminum nitride substrate according to the present invention is an aluminum nitride substrate having aluminum nitride as a main component and comprising a polycrystal containing a plurality of aluminum nitride grains, and complex oxide grains being present at grain boundaries of the aluminum nitride grains and including a rare earth element and aluminum, wherein the aluminum nitride grains have a maximum grain size of 10 μm or less, the complex oxide grains have a maximum grain size smaller than the maximum grain size of the aluminum nitride grains, the number of the complex oxide grains having a grain size of 1 μm or more being present in a field of view of 100 μm×100 μm of a surface of the aluminum nitride substrate observed is 40 or more, the aluminum nitride substrate has a bending strength of 400 MPa or more in an unpolished state after firing, and the aluminum nitride substrate has a volume resistivity of 1012 Ωm or more.