Actuator with non-moving mass
View Patent ↗An actuator for a tape drive is disclosed. The actuator has a moving mass and a non-moving mass. The non-moving mass is at least 107 grams.
1. An actuator for a tape drive, comprising:
a non-moving mass comprising:
at least two permanent magnets held inside a magnet bracket;
an inner pole piece positioned inside the magnet bracket between the at least two permanent magnets;
at least one bearing support rod attached to a front side of the inner pole piece;
a moving mass comprising: an actuator head assembly, the actuator head assembly having a coil positioned in a gap between the inner pole piece and the at least two permanent magnets, the moving mass configured to translate along an axis formed by the inner pole piece;
wherein the ratio of the moving mass over the non-moving mass is less than 0.120.
2. The actuator of claim 1 , wherein the mass of the magnet bracket is at least 37 grams.
3. The actuator of claim 1 , wherein the moving mass is between 10 grams and 14 grams.
4. The actuator of claim 1 , wherein the non-moving mass is between 90 grams and 290 grams.
5. The actuator of claim 1 , wherein the ratio of the moving mass over the non-moving mass is less than 0.050.
6. The actuator of claim 1 , further comprises:
a base, wherein the magnet bracket and the inner pole piece are attached to a top side of the base;
wherein the at least one bearing support rod comprises a front bearing support rod attached to the front side of the inner pole piece and a rear bearing support rod attached to the top side of the base near a rear side of the inner pole piece;
two slugs positioned inside holes formed in the magnet bracket with the slugs contacting the top of the inner pole piece;
the non-moving mass further comprising: the mass of the front bearing support rod, the rear bearing support rod, the two slugs and the base.
7. The actuator of claim 6 , wherein only 75% of the mass of the base is included in the non-moving mass.
8. The actuator of claim 1 , wherein the frequency response of the actuator is less than −7 db at 2800 Hz.
9. The actuator of claim 1 , wherein the actuator head assembly includes a read/write head for the tape drive.
10. An actuator for a tape drive, comprising:
a non-moving mass comprising:
at least two permanent magnets held inside a magnet bracket;
an inner pole piece positioned inside the magnet bracket between the at least two permanent magnets;
a base, wherein the magnet bracket and the inner pole piece are attached to a top side of the base;
a front bearing support rod attached to a front side of the inner pole piece;
a rear bearing support rod attached to the top side of the base near a rear side of the inner pole piece;
two slugs positioned inside holes formed in the magnet bracket with the slugs contacting the top of the inner pole piece;
a moving mass comprising and actuator head assembly, the actuator head assembly having a coil positioned in a gap between the inner pole piece and the at least two permanent magnets, the moving mass configured to translate along an axis formed by the inner pole piece;
wherein the non-moving mass is at least 100 grams.
11. The actuator of claim 10 , wherein the moving mass is between 10 grams and 14 grams.
12. The apparatus of claim 10 , wherein the magnet bracket has a mass of at least 70 grams.
13. The apparatus of claim 10 , wherein only between 60 and 100% of the total mass of the base is included in the non-moving mass.
14. The apparatus of claim 10 , wherein the non-moving mass is at least 130 grams.
15. An actuator for a tape drive, comprising:
a non-moving mass comprising:
at least two permanent magnets held inside a magnet bracket;
an inner pole piece positioned inside the magnet bracket between the at least two permanent magnets;
a base, wherein the magnet bracket and the inner pole piece are attached to a top side of the base;
a front bearing support rod attached to a front side of the inner pole piece;
a rear bearing support rod attached to the top side of the base near a rear side of the inner pole piece;
two slugs positioned inside holes formed in the magnet bracket with the slugs contacting the top of the inner pole piece;
a moving mass comprising and actuator head assembly, the actuator head assembly having a coil positioned in a gap between the inner pole piece and the at least two permanent magnets, the moving mass configured to translate along an axis formed by the inner pole piece;
wherein the frequency response of the actuator at 2800 Hz is less than −7 db.