1. A polymer fiber comprising at least two dissolvable sections, wherein the rate at which at least part of the fiber dissolves is controlled at least in part by providing different dissolvable components in the at least two dissolvable sections that are at least partially soluble in the same dissolving medium.
2. The fiber of claim 1, further comprising a plurality of island sections extending in a longitudinal direction of the fiber and separated from each other and at least partially surrounded along the longitudinal dimensions of the island sections by a sea section, wherein the sea section includes one or more dissolvable components.
3. The fiber of claim 2, wherein the fiber includes at least 10 island sections.
4. The fiber of claim 2, wherein the cross-sectional geometry of the sea section is elongated and has an aspect ratio greater than 1.
5. The fiber of claim 2, wherein the sea section includes one of a ribbon-shaped cross-section and a tri-lobal cross-section.
6. The fiber of claim 2, wherein an agent material is dispersed through at least one of the island sections and the sea section.
7. The fiber of claim 2, wherein the island sections include a dissolvable component that is different from the dissolvable component of the sea section.
8. The fiber of claim 1, further comprising a longitudinally extending core section and a longitudinally extending sheath section that at least partially surrounds the core section along the longitudinal dimension of the core section, wherein the sheath and core sections include different dissolvable components and the core section is disposed along a central axis of the fiber.
9. The fiber of claim 8, further comprising a plurality of island sections extending in a longitudinal direction of the fiber and separated from each other within at least one of the sheath and core sections.
10. The fiber of claim 8, further comprising an agent material dispersed within at least one of the island, sheath and core sections.
11. The fiber of claim 8, further comprising a plurality of consecutively aligned sheath sections disposed at increasing radial positions from the core section, wherein each core and sheath section includes a dissolvable component that differs from the dissolvable component of an adjacent core or sheath section.
12. The fiber of claim 11, wherein at least one of the core and sheath sections includes an agent material dispersed therein.
13. A medical device comprising the fiber of claim 1.
14. A polymer fiber comprising a plurality of longitudinally extending and successively nested sections, wherein at least two nested sections are dissolvable and include at least one of a plurality of longitudinally extending island sections and a dispersed agent material.
15. The fiber of claim 14, wherein adjacent nested sections include different dissolvable components.
16. The fiber of claim 14, wherein at least one of a plurality of longitudinally extending island sections and a dispersed agent material is disposed in successively alternating nested sections.
17. A polymer fiber comprising at least two dissolvable sections including different dissolvable components, the different dissolvable components being at least partially soluble in the same dissolving medium, wherein the rate at which at least part of the fiber dissolves is controlled at least in part by a dissolvable section having a non-round cross-sectional geometry.
18. The fiber of claim 17, wherein the cross-sectional geometry is one of a ribbon-shaped cross-section and a tri-lobal cross-section.
19. A polymer fiber comprising at least two sections, wherein at least one fiber section includes a dissolvable component, and the rate at which at least part of the fiber dissolves is controlled at least in part by providing a fiber section including the dissolvable component with an elongated cross-sectional geometry that has an aspect ratio greater than about 2.
20. The polymer fiber of claim 19, wherein the fiber section including the component has a ribbon-shaped cross-section.
21. The polymer fiber of claim 19, further comprising a plurality of island sections extending in a longitudinal direction of the fiber and separated from each other and at least partially surrounded along the longitudinal dimensions of the island sections by a sea section, wherein the sea section that includes the dissolvable component.
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 motor comprising:
a rotor unit arranged to rotate about a center axis, the rotor unit including:
a rotor hub having a substantially circular shape centered about the center axis;
a shaft concentric with the rotor hub and attached to an approximately middle portion of the rotor hub;
a rotor yoke having a substantially hollow cylindrical shape concentric with the shaft, an entire circumference of an axial end portion of the rotor yoke being crimped to the rotor hub along an outer circumferential portion of the rotor hub; and
a rotor magnet arranged at an inner circumferential surface of the rotor yoke; and
a stator unit rotatably supporting the rotor unit, the stator unit including:
a sleeve having a substantially hollow cylindrical shape concentric with the center axis, the sleeve being impregnated with lubricating oil to rotatably support the shaft; and
a stator arranged to face the rotor magnet.
2. The motor as set forth in claim 1, further comprising a sealant present on an entire circumference where the rotor hub and the rotor yoke are crimped to each other.
3. The motor as set forth in claim 2, wherein the sealant is provided along the entire circumference in a fluid state and then hardened, and the sealant is selected from a group including an adhesive, a resin material, and a paint material.
4. The motor as set forth in claim 3, wherein the sealant is a UV curable adhesive.
5. The motor as set forth in claim 1, wherein the rotor hub and the rotor yoke are welded along the entire circumference of the rotor yoke.
6. The motor as set forth in claim 1, further comprising:
a housing including an inner circumferential surface supporting the sleeve, an outer circumferential surface supporting the stator, and an annular concave portion at which the inner circumferential surface of the housing is radially outwardly recessed; and
an oil supply member arranged in the annular concave portion.
7. The motor as set forth in claim 1, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a cap arranged at a bottom surface of the housing and crimped to the housing to close the bottom end opening of the housing; and
a sealant applied to a portion at which the cap and the housing are crimped.
8. The motor as set forth in claim 1, wherein the rotor hub is made of aluminum.
9. The motor as set forth in claim 1, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a bias magnet arranged at an axial end portion of the stator unit and having an annular shape whose inner circumferential surface faces an outer circumferential surface of the shaft with a gap defined therebetween; and
a ring member made of magnetic material and arranged to axially face the bias magnet.
10. The motor as set forth in claim 1, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a back yoke arranged at an axial end portion of the stator unit and having an annular shape whose inner circumferential surface faces an outer circumferential surface of the shaft with a gap defined therebetween;
a bias magnet having an annular shape and arranged on the back yoke; and
a ring member made of magnetic material and arranged to axially face the bias magnet.
11. The motor as set forth in claim 1, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a ring member made of magnetic material and arranged on the stator unit, the ring member having an inner circumferential surface facing an outer circumferential surface of the shaft with a gap defined therebetween; and
a bias magnet arranged on the rotor unit and axially facing the ring member.
12. The motor as set forth in claim 1, wherein the rotor hub includes a placing surface defined by a substantially flat surface that is substantially perpendicular to the center axis, and a color wheel fixed to the placing surface.
13. A motor including a rotor unit arranged to rotate about a rotational axis and a stator unit rotatably supporting the rotor unit, comprising:
a rotor hub of the rotor unit having a substantially circular shape centered on the rotational axis;
a shaft concentric with the rotor hub and attached to an approximately middle portion of the rotor hub;
a rotor yoke having a substantially hollow cylindrical shape concentric with the shaft, an entire circumference of an axially end portion of the rotor yoke being welded to an outer circumferential portion of the rotor hub;
a rotor magnet arranged at an inner circumferential surface of the rotor yoke;
a sleeve of the stator unit having a substantially hollow cylindrical shape concentric with the rotational axis, and being impregnated with lubricating oil to rotatably support the shaft; and
a stator of the stator unit facing the rotor magnet.
14. The motor as set forth in claim 13, further comprising:
a housing including an inner circumferential surface supporting the sleeve, an outer circumferential surface supporting the stator, and an annular concave portion at which the inner circumferential surface of the housing is radially outwardly recessed; and
an oil supply member arranged in the annular concave portion.
15. The motor as set forth in claim 13, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a cap arranged at a bottom surface of the housing and crimped to the housing to close the bottom end opening of the housing; and
a sealant applied to a portion at which the cap and the housing are crimped.
16. The motor as set forth in claim 13, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a bias magnet arranged at an axial end portion of the stator unit and having an annular shape whose inner circumferential surface faces an outer circumferential surface of the shaft with a gap defined therebetween; and
a ring member made of magnetic material and arranged to axially face the bias magnet.
17. The motor as set forth in claim 13, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a back yoke arranged at an axial end portion of the stator unit and having an annular shape whose inner circumferential surface faces an outer circumferential surface of the shaft with a gap defined therebetween;
a bias magnet having an annular shape and arranged on the back yoke;
a ring member made of magnetic material and arranged to axially face the bias magnet.
18. The motor as set forth in claim 13, further comprising:
a housing having a substantially hollow cylindrical shape with an upper end opening, a bottom end opening, an inner circumferential surface supporting the sleeve, and an outer circumferential surface supporting the stator;
a ring member made of magnetic material and arranged on the stator unit, the ring member having an inner circumferential surface facing an outer circumferential surface of the shaft with a gap defined therebetween; and
a bias magnet arranged on the rotor unit and axially facing the ring member.
19. The motor as set forth in claim 13, wherein the rotor hub includes a placing surface defined by a substantially flat surface that is substantially perpendicular to the rotational axis, and a color wheel fixed to the placing surface.
20. A motor including a rotor unit rotating about a rotational axis and a stator unit rotatably supporting the rotor unit, comprising:
a rotor hub of the rotor unit having a substantially circular shape centered on the rotational axis;
a shaft concentric with the rotor hub and attached to an approximately middle portion of the rotor hub;
a ring member made of magnetic material and arranged on the rotor hub;
a rotor yoke having a substantially hollow cylindrical shape concentric to the shaft, an entire circumference of an axial end portion of the rotor yoke being crimped to an outer circumferential portion of the rotor hub;
a rotor magnet arranged at an inner circumferential surface of the rotor yoke;
a housing of the stator unit having a substantially hollow cylindrical shape with an inner circumferential surface and an outer circumferential surface;
a sleeve rotatably supporting the shaft and having a substantially hollow cylindrical shape concentric with the rotational axis, an outer circumferential surface of the sleeve being fixed to the inner circumferential surface of the housing;
a stator arranged at the outer circumferential surface of the housing and facing the rotor magnet;
a back yoke arranged at a portion of the stator unit near an axial end portion of the sleeve;
a bias magnet having an annular shape arranged on the back yoke and axially facing the ring member; and
a gap defined between the shaft and an inner circumferential surface of at least one of the bias magnet and the back yoke.
21. The motor as set forth in claim 20, wherein the housing includes an annular concave portion at which the inner circumferential surface of the housing is radially outwardly recessed, and an oil supply member is arranged in the annular concave portion.
22. The motor as set forth in claim 20, wherein the housing includes an upper end opening and a bottom end opening, the motor further comprising:
a cap arranged at a bottom surface of the housing and crimped to the housing to close the bottom end opening of the housing; and
a sealant applied to a portion at which the cap is crimped to the housing.
23. The motor as set forth in claim 20, wherein the rotor hub includes a placing surface defined by a substantially flat surface that is substantially perpendicular to the rotational axis, and a color wheel fixed to the placing surface.
24. A display unit comprising:
a color wheel assembly including a rotary color wheel having color filters on a circular disk and arranged to project and display a color picture image, and a motor according to claim 1 arranged to drive the color wheel; and
a light source arranged to emit light toward the color wheel;
a digital micro mirror device arranged to reflect light transmitted through the color wheel by movable mirrors;
a projection optical system arranged to project the light reflected from the digital micro mirror device onto a screen; and
a case arranged to house the color wheel assembly, the light source, the digital micro mirror device, and the projection optical system.
25. A display unit comprising:
a color wheel assembly including a rotary color wheel having color filters on a circular disk and arranged to project and display a color picture image, and a motor according to claim 13 arranged to drive the color wheel;
a light source arranged to emit light toward the color wheel;
a digital micro mirror device arranged to reflect light transmitted through the color wheel by movable mirrors;
a projection optical system arranged to project the light reflected from the digital micro mirror device onto a screen; and
a case arranged to house the color wheel assembly, the light source, the digital micro mirror device, and the projection optical system.
26. A display unit comprising:
a color wheel assembly including a rotary color wheel having color filters on a circular disk and arranged to project and display a color picture image, and a motor according to claim 20 arranged to drive the color wheel;
a light source arranged to emit light toward the color wheel;
a digital micro mirror device arranged to reflect light transmitted through the color wheel by movable mirrors;
a projection optical system arranged to project the light reflected from the digital micro mirror device onto a screen; and
a case arranged to house the color wheel assembly, the light source, the digital micro mirror device, and the projection optical system.