1. A disk drive recirculation filter comprising electrostatic media, said electrostatic media comprising at least two layers, at least one of said layers having a felt basis weight of less than 55 gm2 and a felt density, said electrostatic filter media having a maximum continuous felt thickness greater than 0.50 mm and wherein the ratio of continuous felt thickness to felt density is greater than 20.
2. A disk drive recirculation filter of claim 1, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
3. A disk drive recirculation filter comprising electrostatic media, said electrostatic media comprising at least two layers, at least one of said layers having a felt basis weight of less than 75 gm2 and a felt density, said electrostatic filter media having a maximum continuous felt thickness greater than 0.635 mm and wherein the ratio of continuous felt thickness to felt density is greater than 20.
4. A disk drive filter of claim 3, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
5. A disk drive recirculation filter comprising electrostatic media, said electrostatic media comprising at least two layers, at least one of said layers having a felt basis weight of less than 100 gm2 and a felt density, said electrostatic filter media having a maximum continuous felt thickness greater than 0.70 mm and wherein the ratio of continuous felt thickness to felt density is greater than 20.
6. A disk drive filter of claim 5, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
7. A disk drive recirculation filter comprising electrostatic media, said electrostatic media comprising at least two layers, at least one of said layers having a felt basis weight of less than 110 gm2 and a felt density, said electrostatic filter media with a maximum continuous felt thickness greater than 0.76 mm and wherein the ratio of continuous felt thickness to felt density is greater than 20.
8. A disk drive filter of claim 7, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
9. A disk drive recirculation filter comprising electrostatic media, said electrostatic media comprising at least two layers, at least one of said layers having a felt basis weight of less than 165 gm2 and a felt density, said electrostatic filter media having a maximum continuous felt thickness greater than 1.27 mm and wherein the ratio of continuous felt thickness to felt density is greater than 20.
10. A disk drive filter of claim 9, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
11. A disk drive recirculation filter for use within a disc drive, the recirculation filter comprising:
a) a first electrostatic filter layer comprising a plurality of electrostatic fibers having a first thickness; and
b) a second electrostatic filter layer comprising a plurality of electrostatic fibers having a second felt thickness wherein said first electrostatic filter layer and said second electrostatic filter layer are in continuous laminar relation and form a electrostatic felt layer having a thickness and wherein the electrostatic felt layer has a density such that the ratio of thickness of the electrostatic felt layer to the density of the felt is greater than 20.
12. A disk drive recirculation filter of claim 11, further comprising one or more cover layers surrounding the electrostatic filter layers.
13. A disk drive recirculation filter of claim 11, further having a sealed edge around the perimeter of the filter.
14. A disk drive recirculation filter of claim 11, further comprising at least one layer of PTFE membrane in a laminar relation with the electrostatic filter media.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed us:
1. An apparatus for acquiring human finger manipulation data comprising:
at least one finger motion detector composed essentially of a force sensor capable of being fitted on a human fingertip, at least three links and at least four angle detectors; and
a base supporting the finger motion detector;
wherein the base is attachable to an external mount or a human hand,
the force sensor is fittable on a human finger and connected to the base through a link mechanism constituted by the plurality of links,
the at least four angle detectors are attached at pivots between the links constituting the link mechanism and optionally at a pivot between the link mechanism and the base,
three-dimensional motion of the finger is determined by measuring data of the angle detectors of the link mechanism, and
fingertip contact force is measured by the force sensor.
2. An apparatus according to claim 1, wherein the angle detectors are potentiometers or encoders.
3. An apparatus according to claim 1, wherein not fewer than one and not more than five finger motion detectors are supported on the base.
4. An apparatus according to claim 2, wherein not fewer than one and not more than five finger motion detectors are supported on the base.
5. An apparatus according to claim 1, further comprising an inclination angle sensor installed on the base for measuring inclination of the base relative to vertical.
6. An apparatus according to claim 2, further comprising an inclination angle sensor installed on the base for measuring inclination of the base relative to vertical.
7. An apparatus according to claim 3, further comprising an inclination angle sensor installed on the base for measuring inclination of the base relative to vertical.
8. An apparatus according to claim 1, wherein the base is attached to a glove to be worn on a human hand.
9. An apparatus according to claim 2, wherein the base is attached to a glove to be worn on a human hand.
10. An apparatus according to claim 3, wherein the base is attached to a glove to be worn on a human hand.
11. An apparatus according to claim 4, wherein the base is attached to a glove to be worn on a human hand.
12. An apparatus according to claim 5, wherein the base is attached to a glove to be worn on a human hand.
13. An apparatus according to claim 6, wherein the base is attached to a glove to be worn on a human hand.
14. An apparatus according to claim 7, wherein the base is attached to a glove to be worn on a human hand.