Method for assembling an actuator device for a hard disk, comprising a read/write transducer, a microactuator, and a suspension, and the actuator device thus obtained

• US 6,501,623 B1
• Filed: 07/20/1999
• Issued: 12/31/2002
• Est. Priority Date: 07/30/1998
• Status: Expired due to Term

• Current Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Inventors: Mastromatteo, Ubaldo, Zerbini, Sarah, Vigna, Benedetto, Sassolini, Simone
• Primary Examiner(s): Miller, Brian E.
• Application Number:
  US09/357,078
• Time in Patent Office: 1,260 Days
• Field of Search: 360/246.7, 360/245.8, 360/245.9, 360/294--29, 360/264.5, 360/245.2, 360/245, 360/245.3, 360/234.6, 360/245.4
• US Class Current: 360/245.3
• CPC Class Codes: G11B 5/11 Shielding of head against electric or magnetic fields
• CPC Class Codes: G11B 5/5552 using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means

Abstract

A microactuator is attached to a first face of a coupling formed on a suspension, so that an R/W transducer projects from an opposite face. A hole in the coupling permits passage of an adhesive mass interposed between a rotor of the microactuator and the R/W transducer. A strip of adhesive material extends between a die accommodating the microactuator and the coupling, and externally surrounds the microactuator. The coupling acts as a protective shield for the microactuator, both mechanically and electrically. The coupling covers the microactuator at the front, and prevents foreign particles from blocking the microactuator. In addition, the coupling electrically insulates the R/W transducer, which is sensitive to magnetic fields, from regions of the microactuator biased to a high voltage. With the coupling, the strip forms a sealing structure, which in practice surrounds the microactuator on all sides.

Claims

1. An actuator device for a hard disk, comprising:

a read/write (R/W) transducer;

a microactuator;

a suspension plate having a first face and a second face opposed to said first face, wherein said microactuator is connected to said first face of said suspension plate and said R/W transducer projects from said microactuator to a position beyond said second face of said suspension plate; and

a fixing strip extending between a body accommodating said microactuator and said suspension plate, wherein said fixing strip externally surrounds said microactuator and seals the microactuator between the body and the suspension plate.

2. The device according to claim 1 wherein said suspension plate is arranged between said microactuator and said R/W transducer, and is formed with a through-hole accommodating a connection structure between said microactuator and said R/W transducer.

3. The device according to claim 2 wherein said connection structure comprises a fixing mass arranged between a movable region of said microactuator and said R/W transducer and wherein said through-hole has larger dimensions than said fixing mass and smaller dimensions than an area of said R/W transducer.

4. An actuator device for a hard disk, comprising:

a read/write (R/W) transducer;

a microactuator; and

a suspension plate having a first face and a second face opposed to said first face, wherein said microactuator is connected to said first face of said suspension plate and said R/W transducer projects beyond said second face of said suspension plate, wherein said suspension plate is formed with a through-hole having larger dimensions than said R/W transducer and wherein said R/W transducer is rigidly connected to said microactuator and extends partially in said through-hole.

5. The device according to claim 4 wherein said R/W transducer is rigidly connected to a movable structure of said microactuator by a fixing mass.

6. The device according to claim 4, further comprising suspended electrical connection regions extending above a body accommodating said microactuator, and facing said first face of said suspension plate, wherein said electrical connection regions are electrically connected to contact pads of said R/W transducer, wherein said contact pads are arranged near said through-hole and conductive tracks formed on said suspension plate.

7. The device according to claim 6 wherein said suspension plate comprises:

a support layer;

an intermediate insulating layer; and

a conductive layer, wherein said intermediate insulating layer and said conductive layer are selectively removed to form electrical connection regions extending substantially coplanar to said second face of said suspension plate, wherein said electrical connection regions are electrically connected to contact pads of said R/W transducer, and wherein said contact pads are arranged near said second face of said suspension plate and conductive tracks formed on said suspension plate.

8. The device according to claim 5 wherein said fixing mass and said fixing strip comprise a polymer material curable by ultraviolet (UV) rays or by heat.

9. A system operable to actuate a hard disk, the system comprising:

a motor element;

a suspension coupled to the motor element and movable across the hard disk in response to the motor element, wherein the suspension includes a gimbal having first and second faces;

an actuator device including a microactuator connected to the first face of the gimbal and a transducer connected to the microactuator and projecting from a position on a plane adjacent to the first face of the gimbal to a position beyond the second face of the gimbal; and

suspended electrical connections extending above the microactuator, wherein the suspended electrical connections electrically connect contact pads formed on the transducer to conductive tracks formed on the gimbal.

10. The system of claim 9 wherein the gimbal is formed with an aperture between the first and second faces and wherein the aperture is sized such that the transducer extends at least partially through the aperture.

11. The system of claim 9 wherein the gimbal substantially covers a surface of the microactuator to reduce particle contamination of the microactuator or to reduce electrostatic interference between the microactuator and the transducer.

12. A system operable to actuate a hand disk, the system comprising:

a motor element;

a suspension coupled to the motor element and movable across the hard disk in response to the motor element, wherein the suspension includes a gimbal having first and second faces;

an actuator device including a microactuator connected to the first face of the gimbal and a transducer connected to the microactuator and projecting from a position on a plane adjacent to the first face of the gimbal to a position beyond the second face of the gimbal;

a sealing structure of a dielectric material laterally surrounding the microactuator and connecting the microactuator to the first face of the gimbal; and

a connection element connecting the transducer to the microactuator.