Abstract: Radial dynamic pressure grooves are provided in a first region 4A and a second region 4B on the side of a fixed shaft 2. A vent 2D is provided inside the top end 2A of the fixed shaft 2. The vent 2D connects spaces over and under a flange 3 to each other. The flange 3 in an annular shape is fixed at the top end 2A of the fixed shaft 2. Thrust dynamic pressure grooves 3A and 3B are provided on the surfaces of the flange 3. A circulation hole 3C is provided in the flange 3, and connects spaces over and under the flange 3 to each other. A sleeve 4 revolves around the fixed shaft 2. A thrust plate 6 in an annular shape is fixed at the top of the sleeve 4 and opposed to the flange 3. The first region 4A, the second region 4B, the thrust dynamic pressure grooves 3A and 3B, and the circulation hole 3C of the flange 3 are filled with a lubricant 7.

Abstract: In order to provide a high-accuracy long-life hydrodynamic bearing not causing oil film breakage in bearing clearances and a disc rotation apparatus using the bearing, when the outside diameter of the herringbone pattern of dynamic pressure generation grooves provided on at least one of the opposed faces of a flange and a thrust plate is designated as dlo, the inside diameter thereof is designated as dli and the diameter of the turn-back part thereof is designated as dlm, the diameter dlm of the turn-back part is set so as to satisfy the relationships represented by the following equations:

Abstract: A sleeve 1 is fixed on a base. Radial dynamic-pressure generating grooves 1A and 1B are provided on an inner surface of the sleeve 1. A thrust plate 4 hermetically seals a lower opening end of the sleeve 1. A shaft 2 is inserted inside the sleeve 1, being allowed to revolve. A flange 3 is fixed at the bottom end of the shaft 2, and its lower surface is placed close to an upper surface of the thrust plate 4. Thrust dynamic-pressure generating grooves 3A and 3B are provided on the surfaces of the flange 3. Gaps A-H among the sleeve 1, the shaft 2, the flange 3, and the thrust plate 4 are filled with a lubricant 5. Hollows 1C-1F are provided on the inner surface of the sleeve 1. The gaps A and C over the thrust dynamic-pressure generating grooves 3A and 3B and their vicinities are narrower than the surrounding gaps B and D (A<B, A<D, C<B, and C<D), and the surrounding gaps B and D are narrower than the gap H in the upper opening end of the sleeve 1 and its vicinity (B<H and D<H).

Abstract: A pressure regulating hole by which a center portion of a thrust surface confronting a thrust plate and a lubricant pool portion of an inner circumferential surface of a sleeve are communicated with each other is provided inside the shaft in a fluid dynamic bearing device. Thus, the device is capable of obtaining stable thrust floating characteristics and preventing leaks of the lubricant as well as exhaustion of the lubricant.

Abstract: In order to provide a high-accuracy long-life hydrodynamic bearing not causing oil film breakage in bearing clearances and a disc rotation apparatus using the bearing, when the outside diameter of the herringbone pattern of dynamic pressure generation grooves provided on at least one of the opposed faces of a flange and a thrust plate is designated as d1o, the inside diameter thereof is designated as d1i and the diameter of the turn-back part thereof is designated as d1m, the diameter d1m is selected so that the difference between the diameters dsy and d1m becomes 0.05 mm or more and 0.

Abstract: In a hydrodynamic bearing according to the present invention a fixed shaft has different diameter sizes by positions so that overflow or splashing of lubricant out of the apparatus is prevented due to a centrifugal force during high-speed rotation, and lubricant reservoirs are provided in narrower clearances and in wider clearances so that the lubricant is induced to move toward lubricant reservoirs in narrower clearances due to surface tension while the hydrodynamic bearing is in stop, therefore overflow of the lubricant is prevented at the time of starting up.

Abstract: The present invention relates to a composition for external application, a humectant and a skin barrier function reinforcing agent, each containing a diamide derivative represented by the following formula (1): 1

Abstract: The present invention relates to a dermatologic preparation containing a diamide derivative represented by the following formula (1): 1

Abstract: The present invention relates to a dermatologic preparation containing a diamide derivative represented by the following formula (1): (wherein, R1 represents a linear or branched hydrocarbon group having 1 to 22 carbon atoms which may be substituted by one or more hydroxy and/or alkoxy groups, R2 represents a linear or branched divalent hydrocarbon group having 1 to 12 carbon atoms, and R3 represents a linear or branched divalent hydrocarbon group having 1 to 42 carbon atoms). This diamide derivative (1) is capable of fundamentally improving the water retention capacity and barrier functions of the horny layer, is excellent in miscibility and mixing stability and can be prepared efficiently at a low cost.

Abstract: A center core 1, a secondary coil 3 wound at a secondary bobbin 2 and a primary coil 5 wound at a primary bobbin 4 are placed concentrically inside a coil case 6 in sequence from the inside of the coil case. One end of the secondary coil 3 is connected to the primary coil side and becomes a low-voltage side, and the other side becomes a high-voltage side due to an induced voltage and used with connection to the individual ignition plugs of the internal combustion engine. The radial thickness of the bobbin at the low-voltage side 3a and the high-voltage side 3c of the secondary coil, each located at the both ends of the secondary coil, is made larger than the radial thickness of the bobbin at the center part 3b of the secondary coil. The radial thickness of an insulating layer 8 between the secondary coil 3 and the primary coil 5 at the low-voltage side 3a of the secondary coil is smaller and the radial thickness of the insulating layer at the high-voltage side 3b of the secondary coil is larger.

Abstract: The present invention relates to a composition for external application, a humectant and a skin barrier function reinforcing agent, each containing a diamide derivative represented by the following formula (1): 1

Abstract: In a hydrodynamic bearing according to the present invention a fixed shaft has different diameter sizes by positions so that overflow or splashing of lubricant out of the apparatus is prevented due to a centrifugal force during high-speed rotation, and lubricant reservoirs are provided in narrower clearances and in wider clearances so that the lubricant is induced to move toward lubricant reservoirs in narrower clearances due to surface tension while the hydrodynamic bearing is in stop, therefore overflow of the lubricant is prevented at the time of starting up.

Abstract: A center core 1, a secondary coil 3 wound at a secondary bobbin 2 and a primary coil 5 wound at a primary bobbin 4 are placed concentrically inside a coil case 6 in sequence from the inside of the coil case. One end of the secondary coil 3 is connected to the primary coil side and becomes a low-voltage side, and the other side becomes a high-voltage side due to an induced voltage and used with connection to the individual ignition plugs of the internal combustion engine. The radial thickness of the bobbin at the low-voltage side 3a and the high-voltage side 3c of the secondary coil, each located at the both ends of the secondary coil, is made larger than the radial thickness of the bobbin at the center part 3b of the secondary coil. The radial thickness of an insulating layer 8 between the secondary coil 3 and the primary coil 5 at the low-voltage side 3a of the secondary coil is smaller and the radial thickness of the insulating layer at the high-voltage side 3b of the secondary coil is larger.

Abstract: The present invention improves the characteristic of a trench-type vertical MOSFET. When a trench 23 serving as a gate 25 is formed, it is made in a shape of “&ggr;” which is convex toward the inside of the trench. Thus, the surface area of the trench is reduced so that both gate-source capacitance and gate-drain capacitance can be reduced, thereby shortening the switching time of the MOSFET.

Abstract: A power MOSFET comprises: a semiconductor substrate 21 of a first conduction type; a drain layer 22 of the first conduction type and formed on a surface layer of the substrate; a gate insulating film 25 formed in a partial region on the drain layer 22; a gate electrode 26 formed on the gate insulating film 25; an insulating film 27 formed on the gate electrode; a side wall insulator 28 formed on side walls of the gate insulating film 25, the gate electrode 26, and the insulating film 27; a recess formed on the drain layer 22 and in a region other than a region where the gate electrode 25 and the side wall insulator 28 are formed; a channel layer 23 of a second conduction type opposite to the first conduction type and formed in a range from the region where the recess is formed to a vicinity of the region where the gate electrode 26 is formed; a source region layer 24 of the one conduction type and formed on the channel layer 23 outside the recess; and a wiring layer 29 formed to cover the channel layer 23 whi

Abstract: A center core 1, a secondary coil 3 wound at a secondary bobbin 2 and a primary coil 5 wound at a primary bobbin 4 are placed concentrically inside a coil case 6 in sequence from the inside of the coil case. One end of the secondary coil 3 is connected to the primary coil side and becomes a low-voltage side, and the other side becomes a high-voltage side due to an induced voltage and used with connection to the individual ignition plugs of the internal combustion engine. The radial thickness of the bobbin at the low-voltage side 3a and the high-voltage side 3c of the secondary coil, each located at the both ends of the secondary coil, is made larger than the radial thickness of the bobbin at the center part 3b of the secondary coil. The radial thickness of an insulating layer 8 between the secondary coil 3 and the primary coil 5 at the low-voltage side 3a of the secondary coil is smaller and the radial thickness of the insulating layer at the high-voltage side 3b of the secondary coil is larger.

Abstract: It is an object of the present invention to provide a hydrodynamic bearing which is highly reliable and capable of preventing a lubricant contained therein from flowing out of the bearing. In the hydrodynamic bearing, lower and upper end portions of a stationary shaft are properly spaced from a sleeve and a thrust plate, respectively, and an air channel is provided inside the stationary shaft with one end thereof opening to a space defined between an outer circumferential portion of the stationary shaft and the sleeve and with the other end thereof communicating with the outside. Thus, the hydrodynamic bearing has a highly reliable construction which can assuredly prevent the flow-out of the lubricant.

Abstract: The present invention improves the characteristic of a trench-type vertical MOSFET. When a trench 23 serving as a gate 25 is formed, it is made in a shape of ".gamma." which is convex toward the inside of the trench. Thus, the surface area of the trench is reduced so that both gate-source capacitance and gate-drain capacitance can be reduced, thereby shortening the switching time of the MOSFET.

Abstract: A channel layer is formed in a surface of a semiconductor substrate, and a plurality of trenches are formed in the surface of the semiconductor substrate, the trenches being deeper than the channel layer. Then, gate electrodes are formed in the trenches, respectively, after which body layers are formed between the trenches and source layers are formed adjacent to the trenches.

Abstract: An video signal processing apparatus compresses video signals in the horizontal time axis direction and converts the compressed signal into a double-density signal having twice horizontal scanning frequency. Frequency components are removed from an input digital video signal. Here, the frequency components are twice higher than the chrominance subcarrier frequency of an input digital video signal. The digital video signal from which the frequency components are removed is compressed in a horizontal time axis direction. The horizontal scanning frequency of the compressed video signal is then converted into double.