What is claimed is:
1. A polishing method wherein an inner peripheral end surface andor an outer peripheral end surface of a circular disc having a circular hole in a center portion is polished using an abrasive liquid containing free abrasive grains.
2. A polishing method wherein a glass substrate in the shape of a circular disc having a circular hole in a center portion is immersed in an abrasive liquid containing free abrasive grains, and an inner peripheral end surface andor an outer peripheral end surface of said glass substrate is polished using the abrasive liquid containing the free abrasive grains.
3. A polishing method wherein a glass substrate in the shape of a circular disc having a circular hole in a center portion is immersed in an abrasive liquid containing free abrasive grains, and an inner peripheral end surface andor an outer peripheral end surface of said glass substrate is polished using the abrasive liquid containing the free abrasive grains by rotating a polishing brush or a polishing pad in contact with the glass substrate.
4. The polishing method according to any one of claims 1 to 3 wherein the viscosity of the abrasive liquid containing the free abrasive grains is 1.5 to 25 cps.
5. A method of manufacturing a glass substrate for a magnetic recording medium which comprises a step of polishing an inner peripheral end surface andor an outer peripheral end surface of the glass substrate in the polishing method according to any one of claims 1 to 4.
6. A glass substrate for a magnetic recording medium wherein a surface roughness Ra of a chamfered portion andor a side-wall portion of an inner peripheral end surface andor an outer peripheral end surface is 0.001 to 0.04 m.
7. A magnetic recording medium wherein at least a magnetic layer is formed on the glass substrate for the magnetic recording medium according to claim 6.
8. The magnetic recording medium according to claim 7 which is used as a magnetic recording medium for a magnetic resisting head (MR head) or a great magnetic resisting head (GMR head).
9. The magnetic recording medium according to claim 7 or 8 wherein the magnetic layer is a magnetic layer including Co and Pt.
10. A polishing device which comprises an abrasive liquid container in which an abrasive liquid is contained, a rotary support disposed on a bottom of the abrasive liquid container, a substrate case detachably mounted on the rotary support for holding a large number of circular discs each having a circular hole in a center portion, and a rotary brush inserted in the circular holes of the circular discs.
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 system comprising a medical device comprising an optical fiber, said optical fiber comprising a plurality of sensors configured to report the shape and position of the medical device.
2. The system of claim 1, wherein the medical device comprises a guide wire.
3. The system of claim 1, wherein the medical device comprises an endoscope.
4. The system of claim 3, wherein the endoscope is a colonoscope.
5. The system of claim 1, wherein said medical device comprises two or more optical fibers.
6. The system of claim 1, wherein said medical device contains a single optical fiber.
7. The system of claim 1, wherein said sensors comprise a plurality of fluorophores having different spectral properties.
8. The system of claim 1, wherein said sensors comprise a plurality of quantum dots having different spectral properties.
9. The system of claim 1, wherein said plurality of sensors are spaced along the length and circumference of the optical fiber at defined locations.
10. The system of claim 9, wherein said different circumferential locations are approximately 120 degrees apart from one another.
11. The system of claim 1, wherein said sensors are embedded in a region of the fiber created by removal of a portion of a buffer andor cladding layer of the fiber.
12. The system of claim 1, wherein said shape comprises bends in said medical device.
13. The system of claim 12, wherein said shape comprises pitch and yaw of a region of said medical device.
14. The system of claim 1, further comprising a data collection and analysis component.
15. The system of claim 14, wherein said data collection and analysis component comprises a detector configured to detect signal from said sensors, a computer processor for processing data associated with said signal to generate shape information, and a user interface for displaying said shape information to a user.
16. The system of claim 14, wherein said user interface further displays an image of an environment located at the distal end of the medical device.
17. A method for determining the shape of a medical device, comprising:
a) inserting a medical device comprising an optical fiber, said optical fiber comprising a plurality of sensors into an environment; and
b) detecting the shape of said medical device in said environment by collecting information from said sensors.
18. The method of claim 17, wherein said environment is a colon.
19. The method of claim 17, wherein said medical device is a colonoscope.
20. A method of manufacturing a medical device of claim 1, comprising: a) modifying an optical fiber by removing a portion of a buffer andor cladding material of said optical fiber to create a plurality of cavities and inserting sensors into said plurality of cavities; and b) associating said optical fiber with a medical device such that the fiber is positioned to detect the shape of the medical device.