Abstract: An oil dynamic bearing, a motor and a disk drive adapted to be reduced in both size and thickness are disclosed. The oil dynamic bearing (B) includes at least two bearing portions (B1, B2), each having a bearing near end nearer to the rotational axis or the bearing center of the bearing and a bearing far end farther from the rotational axis or the bearing center of the bearing. The near and bearing far ends are each connected to a taper seal portion, which in turn communicates with the atmosphere. The taper seal portion connected to the bearing near end of the bearing portion (B1) and the taper seal portion connected to the bearing near end of the other bearing portion (B2) make up a common taper seal portion.

Abstract: The invention relates to type A crystal of 5-[{6-(2-fluorobenzyl)oxy-2-naphtyl}methyl]-2,4-thiazolidinedione characterized to have characteristic absorption peaks (2?) at 11.5°±0.3°, 14.5°±0.2°, 16.2°±0.3°, 17.0°±0.3°, 17.7°±0.2°, 18.6°±0.3°, 19.1°±0.2°, 21.3°±0.4°, 22.4°±0.5°, 25.7°±1.5° and 28.3°±10.5° in a powder X-ray diffraction pattern, and also to a method for preparation thereof, and a pharmaceutical composition comprising the same. The crystal is excellent in stability, and has advantages in handling, storage, and pharmaceutical preparation. The invention also relates to type B, C and D crystals of said compound.

Abstract: An oil dynamic bearing, a motor and a disk drive adapted to be reduced in both size and thickness are disclosed. The oil dynamic bearing (B) includes at least two bearing portions (B1, B2), each having a bearing near end nearer to the rotational axis or the bearing center of the bearing and a bearing far end farther from the rotational axis or the bearing center of the bearing. The near and bearing far ends are each connected to a taper seal portion, which in turn communicates with the atmosphere. The taper seal portion connected to the bearing near end of the bearing portion (B1) and the taper seal portion connected to the bearing near end of the other bearing portion (B2) make up a common taper seal portion.

Abstract: A gas dynamic pressure bearing is disclosed in which dynamic pressure generating grooves in a radial bearing pump out gas toward a thrust bearing, and dynamic pressure generating grooves in the thrust bearing pump in gas toward the radial bearings. This structure generates high pressure in the lubrication gas in the connecting portions of the radial bearings and thrust bearings. In order to compensate for the movement of gas by means of this pump-out and pump-in operation, a structure is provided that links the two portions of the radial and thrust bearings where the gas pressure is reduced, or connects these two portions with the space surrounding the bearing.

Abstract: A gas dynamic pressure bearing is disclosed in which dynamic pressure generating grooves in a radial bearing pump out gas toward a thrust bearing, and dynamic pressure generating grooves in the thrust bearing pump in gas toward the radial bearings. This structure generates high pressure in the lubrication gas in the connecting portions of the radial bearings and thrust bearings. In order to compensate for the movement of gas by means of this pump-out and pump-in operation, a structure is provided that links the two portions of the radial and thrust bearings where the gas pressure is reduced, or connects these two portions with the space surrounding the bearing.

Abstract: The invention relates to type A crystal of 5-[{6-(2-fluorobenzyl)oxy-2-naphthyl}methyl]-2,4-thiazolidinedione characterized to have characteristic absorption peaks (2&thgr;) at 11.5°±0.3°, 14.5°±0.2°, 16.2°±0.3°, 17.0°±0.3°, 17.7°±0.20, 18.6°±0.3°, 19.1°±0.2°, 21.3°±0.4°, 22.4°±0.5°, 25.7°±0.5° and 28.3°±0.5° in a powder X-ray diffraction pattern, and also to a method for preparation thereof, and a pharmaceutical composition comprising the same. The crystal is excellent in stability, and has advantages in handling, storage, and pharmaceutical preparation. The invention also relates to type B, C and D crystals of said compound.

Abstract: The invention relates to type A crystal of 5-[{6-(2-fluorobenzyl)oxy-2-naphthyl}methyl]-2,4-thiazolidinedione characterized to have characteristic absorption peaks (2&thgr;) at 11.5°±0.3°, 14.5°±0.2°, 16.2°±0.3°, 17.0°±0.3°, 17.7°±0.2°, 18.6°±0.3°, 19.1°±0.2°, 21.3°±0.4°, 22.4°±0.5°, 25.7°±0.5° and 28.3°±0.5° in a powder X-ray diffraction pattern, and also to a method for preparation thereof, and a pharmaceutical composition comprising the same. The crystal is excellent in stability, and has advantages in handling, storage, and pharmaceutical preparation. The invention also relates to type B, C and D crystals of said compound.

Abstract: Naphthalene derivatives represented by the formula (I): ##STR1## wherein the symbol ##STR2## --X-- represents --O-- or --S--, .dbd.Y-- represents .dbd.N-- or .dbd.CR.sup.5 --, R.sup.1, C.sup.2, R.sup.3, R.sup.4 and R.sup.5 represent hydrogen, halogen, alkyl and the like,R.sup.6 represents hydrogen, alkyl, aryl and the like,n represents an integer of 0 to 3, --- represents a single bond or a double bond, which are useful for reducing blood sugar and blood lipid levels are provided.