I claim:
1. A golf ball comprising:
a core;
an inner cover layer disposed on said core and having a Shore D hardness of from about 60 to about 68, a thickness of from about 0.10 to 0.01 about inches, and comprising a low acid ionomer resin containing no more than 16% by weight of an alpha, beta-unsaturated carboxylic acid; and
an outer cover layer having a Shore D hardness less than 64 and comprising a polyurethane material.
2. The golf ball of claim 1 wherein said inner cover layer has a Shore D hardness of from about 60 to about 66.
3. The golf ball of claim 1 wherein said inner layer has a Shore D hardness of from about 60 to about 64.
4. The golf ball of claim 1 wherein said inner cover layer has a thickness of about 0.0375 inches.
5. The golf ball of claim 1 wherein said inner cover layer has a thickness of about 0.0675 inches.
6. The golf ball of claim 1 wherein said inner cover layer has a thickness of about 0.050 inches.
7. A golf ball comprising:
a core;
an inner cover layer disposed about said core and having a Shore D hardness of from about 55 to about 68, a thickness of from about 0.10 to about 0.01 inches, and comprising an ionomeric resin including no more than 16% by weight of an alpha, beta-unsaturated carboxylic acid and having a modulus of from about 15,000 to about 70,000 psi; and
an outer cover layer disposed about said inner cover layer and having a Shore D hardness less than 64 and comprising a polyurethane material.
8. The golf ball of claim 7 wherein said inner cover layer has a Shore D hardness of from about 60 to about 66.
9. The golf ball of claim 7 wherein said inner cover layer has a Shore D hardness of from about 60 to about 64.
10. The golf ball of claim 7 wherein said inner cover layer has a thickness of about 0.0375 inches.
11. The golf ball of claim 7 wherein said inner cover layer has a thickness of about 0.0675 inches.
12. The golf ball of claim 7 wherein said inner cover layer has a thickness of about 0.050 inches.
13. A golf ball comprising:
a core;
an inner cover layer disposed on said core and having a Shore D hardness of from about 55 to about 60, a thickness of from about 0.10 to about 0.01 inches, and comprising a low acid ionomer resin containing no more than 16% by weight of an alpha, beta-unsaturated carboxylic acid; and
an outer cover layer disposed about said inner cover layer and having a Shore D hardness less than 64 and comprising a polyurethane material.
14. The golf ball of claim 13 wherein said inner cover layer has a Shore D hardness of from about 57 to about 59.
15. The golf ball of claim 13 wherein said inner cover layer has a Shore D hardness of about 58.
16. The golf ball of claim 13 wherein said inner cover layer has a thickness of about 0.0375 inches.
17. The golf ball of claim 13 wherein said inner cover layer has a thickness of about 0.0675 inches.
18. The golf ball of claim 13 wherein said inner cover layer has a thickness of about 0.050 inches.
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 magnetic disk drive comprising:
a first compartment in which a magnetic disk, a head that conducts at least either of data reading and writing operations on said magnetic disk, and a head arm holding said head are disposed; and
a second compartment with an internally disposed driving section that pivotally moves said head arm about a pivot shaft;
wherein said first compartment and said second compartment are separated by an isolation wall provided generally parallel to a recording surface of said magnetic disk, and said pivot shaft is disposed in a penetrating form in an opening of the isolation wall.
2. The magnetic disk drive according to claim 1, wherein:
the opening is of a circular shape; and
said driving section is a voice coil motor that pivots said head arm along the recording surface of said magnetic disk.
3. The magnetic disk drive according to claim 2, wherein the isolation wall is formed of a soft magnetic material.
4. The magnetic disk drive according to claim 1, further comprising a ramp adapted to hold said head thereon after said head has been unloaded from the recording surface of said magnetic disk.
5. The magnetic disk drive according to claim 1, wherein at least part of said driving section is positioned internally with respect to an outer circumference of said magnetic disk.
6. The magnetic disk drive according to claim 1, wherein said pivot shaft is positioned externally to an outer circumference of said magnetic disk.
7. The magnetic disk drive according to claim 1, wherein the opening has a shape that allows said head arm and said pivot shaft to penetrate the opening, and an associated section, except the circular opening that said pivot shaft is to penetrate, is blocked with a sealing material.
8. The magnetic disk drive according to claim 1, wherein:
said magnetic disk and said driving section are each disposed in an independent enclosure; and
the opening is provided in an outer wall of the enclosure in which said magnetic disk is disposed.
9. The magnetic disk drive according to claim 1, wherein:
said magnetic disk and said driving section are arranged in one enclosure; and
said driving section is isolated from said magnetic disk by a cover which shrouds said driving section.
10. The magnetic disk drive according to claim 9, wherein:
said cover has a notch; and
said pivot shaft is disposed in a penetrating form in the notch.
11. The magnetic disk drive according to claim 1, wherein the head arm includes a bearing which is disposed in a penetrating form in the opening of the isolation wall.
12. The magnetic disk drive according to claim 11, wherein the driving section is a voice coil motor that pivots the head arm along the recording surface of the magnetic disk, the voice coil motor including a voice coil installed in the second compartment.
13. A magnetic disk drive comprising:
a first compartment in which a magnetic disk, a head that conducts at least either of data reading and writing operations on the magnetic disk, and a head arm holding the head are disposed;
a second compartment;
driving means, disposed in the second compartment for pivotally moving the head arm about a pivot shaft; and
a isolation wall separating the first compartment and the second compartment, the isolation wall being generally parallel to a recording surface of the magnetic disk, and the pivot shaft is disposed through an opening of the isolation wall.
14. The magnetic disk drive according to claim 13, further comprising a ramp adapted to hold the head thereon after the head has been unloaded from the recording surface of the magnetic disk.
15. The magnetic disk drive according to claim 13, wherein at least part of the driving means is positioned inwardly with respect to an outer circumference of the magnetic disk.
16. The magnetic disk drive according to claim 13, wherein the pivot shaft is positioned externally to an outer circumference of the magnetic disk.
17. The magnetic disk drive according to claim 13, wherein:
the magnetic disk and the driving means are each disposed in an independent enclosure; and
the opening is provided in an outer wall of the enclosure in which the magnetic disk is disposed.
18. The magnetic disk drive according to claim 13, wherein:
the magnetic disk and the driving means are arranged in one enclosure; and
the driving means is isolated from the magnetic disk by a cover which shrouds the driving means.
19. The magnetic disk drive according to claim 18, wherein:
the cover has a notch; and
the pivot shaft is disposed in a penetrating form in the notch.
20. The magnetic disk drive according to claim 13, wherein the isolation wall is formed of a soft magnetic material.