Abstract: First, an axial clearance is measured. Next, lubricating oil is filled between a sleeve and a shaft, and the shaft is disposed such that a flange is positioned above a shank. Further, in a state where the shaft rotates at a rated rotation speed (a predetermined rotation speed), an axial clearance b between the flange and a surface facing a receiving surface of the flange through a flange housing space in the sleeve is measured. Finally, a dynamic pressure bearing satisfying the condition 0.3?b/a?0.55 is judged as a dynamic pressure bearing not having leakage of lubricating oil and abnormal abrasion.

Abstract: The improved sliding bearing provides fitting of a cap into a sleeve with steadily fixation of adhesive, and prevention of the remained adhesive outside of the desired area. The sliding bearing comprises a sleeve, a shaft enclosed in said sleeve, and, a cap fitted into the sleeve, the sleeve having a shouldered hole with a first shoulder on which the cap is held, wherein the internal circumferential surface of the sleeve or the external circumferential surface of the cap includes a second shoulder circumferentially formed thereon. The second shoulder of the sleeve is of an outer diameter larger than the diameter of the cap, and an inner diameter approximately same as or slightly larger than the outer diameter of the cap, while the second shoulder of the cap is of an inner diameter smaller than that of the sleeve, and an outer diameter approximately same as or slightly smaller than the inner diameter of the sleeve.

Abstract: A dynamic pressure bearing is provided in which leakage of liquid lubricant due to precession of a housing can be prevented from occurring. In the dynamic pressure bearing, the inner diameter of a tapered inner peripheral face 20 of the housing 1 which constitutes a capillary sealing portion 23 is gradually increased as moving from an opening 17 toward the inner area in the axial direction. When the housing 1 is rotated, therefore, a centrifugal force applied on liquid lubricant existing on the tapered inner peripheral face 20 acts in the direction along which the liquid lubricant is pushed toward the inner area, as indicated by an arrow 19. Consequently, the centrifugal force which is due to precession of the housing 1, and which pushes the liquid lubricant 15 toward the outside as indicated by an arrow 29 can be cancelled by the force acting in the direction toward the inner area, with the result that leakage of the liquid lubricant due to precession of the housing 1 can be prevented from occurring.

Abstract: A dynamic pressure bearing which can eliminate an unbalanced existence of a lubricant fluid without increasing the diameter of a flange is compact in size and requires a lower rotation torque. The dynamic pressure bearing, axial through holes 21 and 22 of a flange 2 are formed so as to be adjacent to a smaller diameter portion 1B of a shaft 1, and to be opposed to an end face 1A-1 of a larger diameter portion 1A. Thus, the axial through holes 21 and 22 do not reduce the area for forming a bearing surface of the flange 2, so that the unbalanced existence of a lubricant fluid can be eliminated by the axial through holes 21 and 22 without degrading the thrust supporting ability. The diameter of the flange can be reduced, and a stable supporting ability can be attained, and a compact size and a low rotation torque can be realized.

Abstract: The improved sliding bearing provides fitting of a cap into a sleeve with steadily fixation of adhesive, and prevention of the remained adhesive outside of the desired area. The sliding bearing comprises a sleeve, a shaft enclosed in said sleeve, and, a cap fitted into the sleeve, the sleeve having a shouldered hole with a first shoulder on which the cap is held, wherein the internal circumferential surface of the sleeve or the external circumferential surface of the cap includes a second shoulder circumferentially formed thereon. The second shoulder of the sleeve is of an outer diameter larger than the diameter of the cap, and an inner diameter approximately same as or slightly larger than the outer diameter of the cap, while the second shoulder of the cap is of an inner diameter smaller than that of the sleeve, and an outer diameter approximately same as or slightly smaller than the inner diameter of the sleeve.

Abstract: A fingerprint detecting agent and a fingerprint detecting method using the agent, which can be used to detect latent fingerprints being in a wet condition, the fingerprint detecting agent includes a fixer containing silicone series compound, fluoride series compound, hydrocarbon series compound, animal or vegetable oil, higher fatty acid, or higher alcohol, and an arbitrary mixture thereof; a diluent containing polar soluent; a developer containing achromatic colored powder or chromatic colored powder. Latent fingerprints can be easily detected by spraying the fingerprint detecting agent; particularly, even if the latent fingerprints to be detected are in a wet condition, it is possible to detect them speedily and certainly.

Abstract: It is an object of the invention to provide a bearing device in which the bearing performance is not lowered even when the temperature is changed. In order to attain the object, the bearing device has a shaft and a sleeve. The shaft is made of stainless alloyed steel and has dynamic pressure generating grooves of a herringbone-like shape. The sleeve consists of the body made of a copper alloy, and an electroless nickel plated layer which covers the whole surface of the body. The electroless nickel plated layer has a coefficient of thermal expansion which is smaller than that of the body made of a copper alloy. The coefficient of thermal expansion of the shaft made of stainless alloyed steel is smaller than that of the body of the sleeve made of a copper alloy. When the temperature is raised, the electroless nickel plated layer suppresses the amount of thermal expansion of the body.

Abstract: A dynamic pressure bearing has a large load-carrying capacity, and a ridge portion defined between adjacent grooves is prevented from damaging an opposite surface. The bearing includes an axial bearing surface having dynamic pressure generating grooves formed thereon by plastic working. The bearing has ridge portions defined between the adjacent dynamic pressure generating grooves. A top end of the ridge portion has rounded edge portions and a flat bearing surface defined between the edge portions. Since the edge portions of the top end are rounded, an opposite surface is prevented from being damaged. Further, the presence of the flat bearing surface defined between the edge portions results in increased load-carrying capacity.

Abstract: There is provided a dynamic pressure bearing which has a large load-carrying capacity and in which a ridge portion defined between adjacent grooves is prevented from damaging an opposite surface. The bearing includes an axial bearing surface having dynamic pressure generating grooves formed thereon by plastic working. The bearing has ridge portions defined between the adjacent dynamic pressure generating grooves. A top end of the ridge portion has rounded edge portions and a flat bearing surface defined between the edge portions. Since the edge portions of the top end are rounded, an opposite surface is prevented from being damaged. Further, the presence of the flat bearing surface defined between the edge portions results in increased load-carrying capacity.