1. A hydrodynamic bearing device, comprising:
a fixed portion;
a rotating portion which rotates with respect to the fixed portion;
a lubricant to be filled in a gap formed between the rotating portion and the fixed portion;
a dynamic pressure bearing portion for supporting the rotating portion so as to be rotatable with respect to the fixed portion with the lubricant interposed therebetween;
a first gap portion provided in an upper portion of the rotating portion in an axial direction and formed between the rotating portion and the fixed portion;
a first surface portion formed on either a part of the rotating portion or a part of the fixed portion which form the first gap portion in a position above the first gap portion in the axial direction;
a first lube repellant which is applied on the first surface portion in a circular shape with a space of a predetermined distance in a radial direction from an outer edge of the gap portion; and
a second lube repellant which is applied in a circular shape on either the rotation portion or the fixed portion at a position closer to an outer edge of the gap than the first surface portion within the first gap.
2. A hydrodynamic bearing device according to claim 1, wherein:
the first gap portion formed between the rotating portion and the fixed portion has a tapered shape with at least a part of the gap which becomes wider toward outside the dynamic pressure bearing portion.
3. A hydrodynamic bearing device according to claim 1, further comprising a second gap portion provided in a lower portion in the axial direction and is formed between the fixed portion and the rotating portion, wherein:
the second gap portion has a tapered shape with at least part of the gap which becomes wider toward outside the dynamic pressure bearing portion.
4. A hydrodynamic bearing device according to claim 3, wherein a third lube repellant is applied in a circular shape in a lower portion of the second gap portion.
5. A hydrodynamic bearing device according to claim 4, wherein an angle between at least one application surface from the first lube repellant through the third lube repellant and a non application surface is larger than an angle of contact between the lube repellant and the application surface when the lube repellant is in a liquid state.
6. A hydrodynamic bearing device according to claim 4, wherein:
a circular groove is formed in the second gap portion; and
the third lube repellant is applied to a portion from outside of the second gap portion to the circular groove or to outside of the circular groove in the axial direction.
7. A hydrodynamic bearing device according to claim 1, wherein:
a circular groove is formed on at least one of the rotating portion and the fixed portion in the first gap portion; and
the second lube repellant is applied to a portion which includes an outer edge of the first gap portion and is continuous to the circular groove or an upper edge of the circular groove in the axial direction.
8. A hydrodynamic bearing device according to claim 7, wherein the circular grooves are formed on both of the fixed portion and the rotating portion, and the circular grooves are formed on positions so as not to oppose each other.
9. A hydrodynamic bearing device according to claim 1, further comprising:
a second surface portion positioned above the first gap portion, and formed on either a part of the rotating portion or a part of the fixed portion which form the first gap portion; and
a fourth lube repellant applied in a circular shape on the second surface portion at a position spaced apart from the first surface portion toward upper portion in the axial direction.
10. A method for manufacturing a hydrodynamic bearing device according to claim 1, wherein:
the lubricant is supplied to between the first lube repellant and the first gap portion under a decompressed condition; and
the lubricant is made to permeate under a condition of a pressure higher than the decompressed condition.
11. A spindle motor comprising a hydrodynamic bearing device according to claim 1.
12. A recording and reproduction apparatus comprising a spindle motor according to claim 11.
13. A hydrodynamic bearing device, comprising:
a fixed portion;
a rotating portion which rotates with respect to the fixed portion;
a lubricant to be filled in a gap formed between the rotating portion and the fixed portion;
a dynamic pressure bearing portion for supporting the rotating portion so as to be rotatable with respect to the fixed portion with the lubricant interposed therebetween;
a seal surface which is positioned above the dynamic pressure bearing portion and is formed on at least one of the rotating portion and the fixed portion and has a seal function; and
a non-seal surface which is positioned to continue from the seal surface at a position above the seal surface and to which a lube repellant is to be applied, wherein
the lube repellant has a viscosity of 80 mPa\xb7S or smaller at 25\xb0 C. in a liquid state before curing, and
an angle formed by the seal surface and the non-seal surface is larger than an angle of contact of the lube repellant with the non-seal surface when the lube repellant is in a liquid state before curing, and is 60 degrees or smaller.
14. A hydrodynamic bearing device according to claim 13, wherein the seal surface has a surface roughness in maximum height Rz(JIS B0601:2001) of 4.0 or smaller.
15. A hydrodynamic bearing device according to claim 13, wherein:
a circular groove which has one or more arc grooves having a cross-section radius of 50 \u03bcm or longer connected is formed on the seal surface; and
the non-seal surface and the circular groove form one continuous surface.
16. A hydrodynamic bearing device according to claim 13, wherein:
a circular groove which has one or more arc grooves having a cross-sectional radius of 50 \u03bcm or longer connected is formed on the non-seal surface; and
the seal surface and the circular groove form one continuous surface.
17. A hydrodynamic bearing device according to claim 13, wherein a surface roughness of the non-seal surface is larger than a surface roughness of the seal surface.
18. A spindle motor comprising a hydrodynamic bearing device according to claim 13.
19. A recording and reproduction apparatus comprising a spindle motor according to claim 18.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device for occlusion of a corporeal duct, in particular a varicose vein, characterized in that it is formed by several yarns knitted together so as to constitute a cylindrical elongate knitted fabric, that is to say a knitted fabric in which the yarns forming the stitches intersect substantially at the radially inner zone of this knitted fabric.
2. The occlusion device as claimed in claim 1, characterized in that it is made up of yarns of absorbable material, in particular of polylactic acid, polyglycolic acid, or a copolymer of these.
3. The occlusion device as claimed in claim 2, characterized in that the absorbable material constituting the yarns, the number of these yarns and the diameter of these yarns are determined in such a way that the period needed for absorption of the occlusion device is greater than or equal to the period of natural absorption of the treated corporeal duct once the occlusion has been performed.
4. The occlusion device as claimed in claim 1, characterized in that it is made of warp stitches.
5. The occlusion device as claimed in claim 1, characterized in that the yarns forming it are coated with one or more substances of a nature to promote occlusion andor degeneration of the treated corporeal duct, or their surface is treated to increase their thrombogenicity.
6. The occlusion device as claimed in claim 1, characterized in that thermosetting is performed in order to limit the deformability of the stitches and to prevent unraveling.
7. The occlusion device as claimed in claim 1, characterized in that it comprises at least one longitudinal yarn connected at its ends, forming a means acting against lengthening of the occlusion device.
8. A device for positioning the occlusion device as claimed in claim 1 in the corporeal duct to be treated, characterized in that it comprises a longitudinal tube able to contain the occlusion device, grip means being provided to permit gripping of the occlusion device at one end of this tube, namely the distal end of the tube in relation to the orifice through which this tube has been introduced into the corporeal duct to be treated.
9. The positioning device as claimed in claim 8, characterized in that the diameter of the tube is smaller than that of the occlusion devices in the uncompressed state of the latter.
10. The positioning device as claimed in claim 8, characterized in that the grip means are constituted by the yarns forming the occlusion device, in particular by knotting or other grouping together, in particular fusion, of these yarns at the distal end of the occlusion device.
11. The positioning device as claimed in claim 8, characterized in that the grip means are formed by an atraumatic endpiece which is connected to the occlusion devices, being able to be fitted at the distal end of the tube.
12. The positioning device as claimed in claim 8, characterized in that the proximal end of the tube comprises a connector socket, for example of the Luer lock type.