Storage device

• US 6,690,549 B1
• Filed: 02/09/2000
• Issued: 02/10/2004
• Est. Priority Date: 07/29/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sukagawa, Tomoo, Yoshida, Susumu, Koizumi, Yoshiaki, Jinzenji, Akihide, Aikawa, Koichi, Aruga, Keiji, Sasamoto, Tatsuro, Asao, Yasuyoshi
• Primary Examiner(s): Hudspeth, David
• Assistant Examiner(s): SLAVITT, MITCHELL R
• Application Number:
  US09/501,470
• Time in Patent Office: 1,462 Days
• Field of Search: 360/264.4, 360/264.7, 360/264.8, 360/264.9, 360/265, 360/245.9, 360/246.7, 360/264.2
• US Class Current: 360/264.4
• CPC Class Codes: G11B 5/4813 Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm G11B5/484 takes precedence

Abstract

A magnetic disk unit has two actuators each rotating on a common rotary shaft. The two actuators are driven by a voice coil motor. The voice coil motor comprises: a magnetic circuit comprising a magnet provided for the two actuators on a common basis and two yokes, which are associated with the two actuators, respectively, said two yokes being disposed at both sides between which the magnet intervenes; and two coils provided for the two actuators, respectively.

Claims

1. A storage device comprising:

a rotation driving unit for rotating a disk type of storage medium loaded on a center shaft;

two actuators each having a head for picking up information from the storage medium, each of said two actuators rotating on a common rotary shaft and moving the associated head along the storage medium in a radial direction of the storage medium; and

a voice coil motor for rotating said two actuators on the rotary shaft,

wherein said voice coil motor comprises;

a first magnet provided for said two actuators on a common basis; and

two coils provided for said two actuators, respectively, and

wherein said voice coil motor rotates said two actuators on the common rotary shaft independently of one another.

2. A storage device according to claim 1, wherein said storage device further comprises:

two yokes, which are associated with said two actuators, respectively, said two yokes being disposed at both sides between which said first magnet intervenes.

3. A storage device according to claim 1, wherein said two coils are disposed at both sides between which said first magnet intervenes.

4. A storage device according to claim 1, wherein said rotation driving unit rotates a plurality of disk type of storage media each loaded on a coaxial basis on the center shaft, and as the plurality of disk type of storage media, an odd number of pieces of storage media each storing information on both front and back is loaded, and as said two actuators, an even number of pieces of heads for picking up information stored in both surfaces of front and back of the storage medium on a sharing basis for each surface is disposed on said two actuators in such a manner that said even number of pieces of heads are divided into two equal parts on said two actuators.

5. A storage device according to claim 1, wherein said voice coil motor has two second magnets disposed at positions adjacent to said two yokes between the respective said two yokes and said first magnet, respectively.

6. A storage device according to claim 1, wherein said storage device further comprises a stopper for limiting a rotary range of said two actuators.

7. A storage device according to claim 6, wherein said stopper is formed together with said first magnet and said two yokes into a module in one united body.

8. A storage device according to claim 1, wherein said storage device further comprises a flexible substrate for transmitting signals picked up by the heads of said two actuators, said flexible substrate being common to all the heads.