Source: http://www.google.com/patents/US6288985?dq=6,757,710
Timestamp: 2016-07-25 10:38:27
Document Index: 622689082

Matched Legal Cases: ['application No. 08', 'application No. 08', 'application No. 08', 'application No. 08', 'application No. 09', 'application No. 09', 'application No. 09']

Patent US6288985 - Microactuator for fine tracking in a magneto-optical drive - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA storage device for retrieving data stored on a medium includes a lens having a focal axis. The storage device also includes a light source capable of generating light having a direction of propagation that is substantially parallel to the focal axis of the lens as the light passes through the lens....http://www.google.com/patents/US6288985?utm_source=gb-gplus-sharePatent US6288985 - Microactuator for fine tracking in a magneto-optical driveAdvanced Patent SearchPublication numberUS6288985 B1Publication typeGrantApplication numberUS 09/148,168Publication dateSep 11, 2001Filing dateSep 4, 1998Priority dateSep 22, 1997Fee statusLapsedPublication number09148168, 148168, US 6288985 B1, US 6288985B1, US-B1-6288985, US6288985 B1, US6288985B1InventorsNicholas Jordache, Edward GageOriginal AssigneeSeagate Technology LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (15), Non-Patent Citations (18), Referenced by (13), Classifications (35), Legal Events (14) External Links: USPTO, USPTO Assignment, EspacenetMicroactuator for fine tracking in a magneto-optical drive
US 6288985 B1Abstract
A storage device for retrieving data stored on a medium includes a lens having a focal axis. The storage device also includes a light source capable of generating light having a direction of propagation that is substantially parallel to the focal axis of the lens as the light passes through the lens. A support assembly supports the lens over the medium and a lens actuator coupled to the support assembly is capable of moving the lens relative to the light while maintaining the focal axis of the lens substantially parallel to the direction of propagation of the light through the lens.
The present application claims priority from U.S. Provisional Application Serial No. 60/059,488 entitled MICROACTUATOR FOR FINE TRACKING IN A MAGNETO-OPTICAL DRIVE, which was filed on Sep. 22, 1997.
FIG. 1 is a side view of a magneto-optical disc drive.
FIG. 1 is a side view of an optical storage system 98 of one embodiment of the present invention. An optical module 108, which includes a laser, creates a light beam 116 that is directed through an enclosed optical path 112 extending laterally from optical module 108. Light beam 116 reflects off a mirror 114 toward an optical head 100, which focuses the collimated beam into a small spot on a disc 118. Together, optical module 108, optical path 112 and mirror 114 provide a light beam production assembly.
FIG. 19 is an enlarged view of piezoelectric microactuator 746 restrained at one end by swaged flaps 745 of plate 742. Microactuator 746 includes first piezoelectric layer 746 a, second piezoelectric layer 746 c, and center metal shim 746 b bonded between the piezoelectric layers by conductive adhesive. In the “parallel” configuration depicted in FIG. 19, piezoelectric layers 746 a and 746 c are poled in the direction of arrows 752 a and 752 c. A first voltage is applied at terminal 754 a to piezoelectric layer 746 a, and at terminal 754 c to piezoelectric layer 746 c. A second voltage is applied at terminal 754 b to metal shim 746 b. Thus, in the “parallel” configuration, piezoelectric layer 746 a will contract, and piezoelectric layer 746 c will expand, in response to the first and second voltages applied at the terminal. The result is a bending motion (shown in phantom) of piezoelectric microactuator 746, since swage plate 742 restrains one end of microactuator 746. The amount of bending of microactuator 746, and thus the amount of displacement of slider 724 (FIG. 18) connected to microactuator by flexure 722, is precisely controlled by the voltages applied to terminals 754 a, 754 b and 754 c. Thus, microactuator 746 is able to provide high resolution positioning of slider 724 over a selected track of a disc.
In an alternative embodiment depicted by FIG. 20, piezoelectric miroactuator 746 is constructed in a “series” configuration. Piezoelectric layer 746 a is poled in the direction of arrow 756 a, and piezoelectric layer 746 c is poled in the opposite direction, shown by arrow 756 c. A first voltage is applied at terminal 754 a to piezoelectric layer 746 a, and a second voltage is applied at terminal 754 c to piezoelectric layer 746 c. As a result, piezoelectric microactuator 746 bends as indicated in phantom, since one end of microactuator 746 is restrained by swage plate 742. The “series” configuration is simpler and more economical than the “parallel” configuration, since it requires only two connections to the outside surfaces of piezoelectric layers 746 a and 746 c. However, the “series” configuration yields less deflection per volt of applied potential than the “parallel” configuration shown in FIG. 20. The “parallel” configuration is more complex, requiring three electrical connections, the additional connection being made to the center shim. Either of the configurations shown in FIGS. 19 and 20 art acceptable for effecting high resolution positioning of slider 724 over a selected track of a disc.
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