Abstract: The present invention pertains to a biological sample measurement device, which is intended to be easier to use. To achieve this object, the present invention comprises a main body case (1) having a sensor insertion opening into which a sensor for measuring biological samples is inserted, a connection terminal (20) provided within the main body case (1) behind the sensor insertion opening, (5) and a shutter 7 that is provided within the main body case (1) between the sensor insertion opening (5) and the connection terminal (20) and that opens and closes the sensor insertion opening (5). This configuration makes the device easy to use.

Abstract: The present invention pertains to a biological sample measurement device, which is intended to be easier to use. To achieve this object, the present invention comprises a main body case (1) having a sensor insertion opening into which a sensor for measuring biological samples is inserted, a connection terminal (20) provided within the main body case (1) behind the sensor insertion opening, (5) and a shutter 7 that is provided within the main body case (1) between the sensor insertion opening (5) and the connection terminal (20) and that opens and closes the sensor insertion opening (5). This configuration makes the device easy to use.

Abstract: According to the present invention, when processing shafts in a centerless grinding machine, engagement between the shafts is prevented without rearranging the shafts, and thus outer circumferential faces of the shafts can be precisely processed. A shaft 12 is used in a hydrodynamic bearing device, and includes a cylindrical column formed with an outer circumferential face 12a forms a hydrodynamic radial bearing portion, a tapped hole 12j that is formed at a first end of the cylindrical column, and a first projecting portion 12b formed at a second end of the cylindrical column. When the first end and the second end of the shafts 12 are arranged side by side in an axis direction, the first projecting portion 12b of the shaft 12 can not interfere with the tapped hole 12j of the other shaft 12.

Abstract: As axis direction dimensions become smaller in HDD spindle motors as a result of thinner and more compact designs, there is a demand for hydrodynamic bearings with a long lifespan. As a means of solving this problem, a lubricant reservoir section is formed between a sleeve side surface and a cover side surface with a depth varying in a circumferential direction, lubricant is circulated in a bearing gap section, a sleeve end face gap section larger than a bearing gap between a sleeve end face and the cover, and a connecting channel, and the lubricant reservoir section and the sleeve end face gap section are connected via an introducing gap section having a bubble separation function.

Abstract: A hydrodynamic bearing device (30) comprises a shaft (31), a sleeve (32) in which the shaft (31) is installed so as to be able to rotate in relative fashion, a lubricant (34) filled into a minute gap between the shaft (31) and the sleeve (32), a sleeve cover (35) attached to the upper end surface of the sleeve (32), a lubricant reservoir (50) for retaining the lubricant (34) between the sleeve (32) and the sleeve cover (35), and flow suppressing parts (51a, 51b) formed inside the lubricant reservoir (50) so as to protrude in an axial direction.

Abstract: A hydrodynamic bearing device in a hydrodynamic bearing device in which a sleeve (2) is covered with a cover (5), which is capable of easily confirming that a working fluid is favorably filled between the cover and the sleeve, and easily confirming that an adhesive (21) which bonds the cover and the sleeve is favorably filled, and an inspection method of an amount of the working fluid are provided. By using the cover having translucency, the filled state of the working fluid is visually recognized through the cover, and is confirmed with an image recognition apparatus.

Abstract: A hydrodynamic bearing device in a hydrodynamic bearing device in which a sleeve (2) is covered with a cover (5), which is capable of easily confirming that a working fluid is favorably filled between the cover and the sleeve, and easily confirming that an adhesive (21) which bonds the cover and the sleeve is favorably filled, and an inspection method of an amount of the working fluid are provided. By using the cover having translucency, the filled state of the working fluid is visually recognized through the cover, and is confirmed with an image recognition apparatus.

Abstract: According to the present invention, when processing shafts in a centerless grinding machine, engagement between the shafts is prevented without rearranging the shafts, and thus outer circumferential faces of the shafts can be precisely processed. A shaft 12 is used in a hydrodynamic bearing device, and includes a cylindrical column formed with an outer circumferential face 12a forms a hydrodynamic radial bearing portion, a tapped hole 12j that is formed at a first end of the cylindrical column, and a first projecting portion 12b formed at a second end of the cylindrical column. When the first end and the second end of the shafts 12 are arranged side by side in an axis direction, the first projecting portion 12b of the shaft 12 can not interfere with the tapped hole 12j of the other shaft 12.

Abstract: A cylindrical sleeve is rotatably fitted over a fixed shaft erected on a base, the sleeve including an outer collar part at an outer periphery of the lower end portion thereof, a slip-out preventing member for preventing the slip-out from the fixed shaft while allowing the sleeve to rotate is provided on the base, the slip-out preventing member including an inner collar part that engages with the outer collar part in the slip-out direction. A hub is provided on the upper end portion of the sleeve, a pair of upper and lower radial bearings formed with a dynamic pressure generating groove are provided on the inner peripheral surface of the sleeve, and a thrust bearing formed with a dynamic pressure generating groove is provided at the lower end face of the sleeve.

Abstract: As axis direction dimensions become smaller in HDD spindle motors as a result of thinner and more compact designs, there is a demand for hydrodynamic bearings with a long lifespan. As a means of solving this problem, a lubricant reservoir section is formed between a sleeve side surface and a cover side surface with a depth varying in a circumferential direction lubricant is circulated in a bearing gap section, a sleeve end face gap section larger than a bearing gap between a sleeve end face and the cover, and a connecting channel, and the lubricant reservoir section and the sleeve end face gap section are connected via an introducing gap section having a bubble separation function.

Abstract: A hydrodynamic bearing device which can enhance operating efficiency of a step of filling a lubricant and also effectively suppress leakage of the lubricant to an outer peripheral portion of the hydrodynamic bearing device; a spindle motor including the same; and an information recording and reproducing apparatus are provided A hydrodynamic bearing device includes a sleeve, a shaft, a lubricant, a plurality of lube repellent application areas, and a lube repellent non-application area. The sleeve has an insertion hole as a bearing hole on at least one end. The shaft is inserted into the insertion hole of the sleeve and is supported so as to be relatively rotatable with respect to the sleeve. The lubricant is interposed in a clearance between the sleeve and the shaft. The plurality of lube repellent application areas are formed into a circular pattern with the shaft being a substantial center on at positions outside the insertion hole of an open upper surface of the sleeve in a radial direction of the shaft.

Abstract: A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft, and radial bearing parts constituted of dynamic pressure generating grooves are provided on the inner peripheral surface of the sleeve. As for an inside diameter of the sleeve, an inside diameter in a predetermined range from the opening upper end part is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter in a range at a lower end side from the predetermined range. The predetermined range corresponds to a range including a radial bearing part located at the upper end side.

Abstract: The invention provides a hydrodynamic bearing device with a function of circulating the operating fluid by supplying the operating fluid to between the cover and the sleeve by way of a circular communication path, the hydrodynamic bearing device allowing the cover for covering the sleeve to be satisfactorily bonded, preventing the operating fluid from leaking outward, and preventing the adhesive from blocking the opening of the circular communication path; and a spindle motor. An adhesive inflow allowing space for allowing the adhesive from the adhesive setting and bonding part to flow in is formed between the adhesive setting and bonding part for setting the adhesive and bonding the cover and the sleeve, and a space region on the open end side between the cover and the sleeve for circulating and introducing the operating fluid so as to create a space in the cover.

Abstract: A hydrodynamic bearing device in which an introducing minimum clearance for causing capillary phenomenon is formed from the location in the proximity of the opening of a communicating path to the open end of the bearing hole in between the cover and the end face on the open end of the sleeve so that the operating fluid from the communicating path in the sleeve flows into the bearing hole by the capillary phenomenon; a vent hole leading to the outside air is formed on the cover; a fluid storage space for storing the operating fluid is formed on the inside surface of the cover or the end face on the open end of the sleeve to communicate the introducing minimum clearance and the vent hole in the circumferential direction; and the air bubbles separated at the fluid storage space are exhausted outward from the vent hole.

Abstract: A cylindrical sleeve is rotatably fitted over a fixed shaft erected on a base, the sleeve including an outer collar part at an outer periphery of the lower end portion thereof, a slip-out preventing member for preventing the slip-out from the fixed shaft while allowing the sleeve to rotate is provided on the base, the slip-out preventing member including an inner collar part that engages with the outer collar part in the slip-out direction. A hub is provided on the upper end portion of the sleeve, a pair of upper and lower radial bearings formed with a dynamic pressure generating groove are provided on the inner peripheral surface of the sleeve, and a thrust bearing formed with a dynamic pressure generating groove is provided at the lower end face of the sleeve.

Abstract: A method of manufacturing a fluid dynamic bearing in which a stopper is fixed by welding. The bearing comprises a hub, a shaft erected on the hub, a sleeve, a cylindrical wall erected on the hub, and the stopper mounted on the cylindrical wall. The method comprises a first step to hold oil in the bearing gap, and a second step to locate the stopper on the peripheral wall being apart from the interface of the oil to fix the stopper by LASER welding.

Abstract: A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft, and radial bearing parts constituted of dynamic pressure generating grooves are provided on the inner peripheral surface of the sleeve. As for an inside diameter of the sleeve, an inside diameter in a predetermined range from the opening upper end part is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter in a range at a lower end side from the predetermined range. The predetermined range corresponds to a range including a radial bearing part located at the upper end side.

Abstract: The invention provides a hydrodynamic bearing device with a function of circulating the operating fluid by supplying the operating fluid to between the cover and the sleeve by way of a circular communication path, the hydrodynamic bearing device allowing the cover for covering the sleeve to be satisfactorily bonded, preventing the operating fluid from leaking outward, and preventing the adhesive from blocking the opening of the circular communication path; and a spindle motor. An adhesive inflow allowing space for allowing the adhesive from the adhesive setting and bonding part to flow in is formed between the adhesive setting and bonding part for setting the adhesive and bonding the cover and the sleeve, and a space region on the open end side between the cover and the sleeve for circulating and introducing the operating fluid so as to create a space in the cover.

Abstract: A recess (27) is formed in a hub flange surface (21) concentrically with a rotation center axis of a spindle hub (7). The hub flange surface (21) contacts a disk surface (20) at positions on opposite sides of the recess (27) in a radial direction of the disk.

Abstract: A hydrodynamic bearing device in a hydrodynamic bearing device in which a sleeve (2) is covered with a cover (5), which is capable of easily confirming that a working fluid is favorably filled between the cover and the sleeve, and easily confirming that an adhesive (21) which bonds the cover and the sleeve is favorably filled, and an inspection method of an amount of the working fluid are provided. By using the cover having translucency, the filled state of the working fluid is visually recognized through the cover, and is confirmed with an image recognition apparatus.