Dynamic information storage or retrieval – Detail of optical slider per se
Reexamination Certificate
1999-02-05
2001-04-17
Klimowicz, William (Department: 2652)
Dynamic information storage or retrieval
Detail of optical slider per se
C360S234300
Reexamination Certificate
active
06219332
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to optical disc data storage systems. More specifically, the present invention relates to a slider for use in an optical head gimbal assembly of an optical disc data storage system.
Optical data storage disc systems are a promising technology for storing large quantities of data. The data is accessed by focusing a laser beam onto a data surface of the disc and detecting light reflected from or transmitted through the data surface.
In general, in optical storage systems, data is in the form of physical or magnetic marks carried on the surface of the disc which are detected using the reflected laser light. There are a number of different optical disc technologies which are known in the industry. For example, compact discs are currently used to store digital data such as computer programs or digitized music. Typically, compact discs are permanently recorded during manufacture. Another type of optical system is write-once read-many (WORM) systems in which a user may permanently write information onto a blank disc. It is also desirable to provide a system which is erasable, such as phase change and magneto-optic (M-O) systems. Phase change systems detect data by sensing a change in reflectivity. M-O systems read data by measuring the rotation of the incident light polarization due to the storage medium.
High density optical recording, particularly for near-field recording (i.e., M-O or phase change systems) typically requires an optical head gimbal assembly (OHGA) for carrying the transducing device over the data surface of the optical media. The OHGA includes a slider which “flies” proximate the data surface of the optical disc as the disc rotates at a high speed. An actuator is used to radially position the slider over the disc surface. U.S. Pat. No. 5,497,359 shows an example of a slider for use with an optical disc data storage system.
Optical disc data storage systems which use the “near field” (or evanescent field) include a Solid Immersion Lens (SIL). Such near field technology is shown in U.S. Pat. No. 5,125,750 to Corle et al. which issued Jun. 30, 1992 entitled “OPTICAL RECORDING SYSTEM EMPLOYING A SOLID IMMERSION LENS” and in U.S. Pat. No. 5,497,359 to Mamin et al. entitled “OPTICAL DISC DATA STORAGE SYSTEM WITH RADIATION-TRANSPARENT AIR-BEARING SLIDER” which issued Mar. 5, 1996. Typical SIL structures include a hemispherical lens cap positioned on a top side of the slider and an optical mesa structure positioned on the air bearing side of the slider. The optical mesa must be positioned very close to the data surface of the optical disc in order for their to be near field optical coupling. Typically this is on the order of less than a few wavelengths.
SUMMARY OF THE INVENTION
The present invention provides a slider having a mesa which is protected from contact with the optical disc data storage system. In an optical disc data storage system, an optical disc includes a data surface. An actuator arm having a distal end is selectively radially positioned adjacent the data surface. A transducing element including an optical source is provided for transducing information. A controller coupled to the actuator arm and the transducing element positions the actuator arm and transduces information on the data surface through the transducing element. A slider coupled to the distal end of the actuator arm carries the transducing element. The slider includes a top surface, and an air bearing surface adapted to move adjacent the data surface as the disc rotates. A mesa is carried on the air bearing surface. In one aspect of the present invention, the air bearing surface includes a protrusion. The optical mesa is spaced apart from the protrusion in a direction away from the data surface whereby the protrusion prevents contact between the data surface and the optical mesa. Another aspect of the invention includes pitching the slider whereby the mesa does not contact the data surface.
REFERENCES:
patent: 3980811 (1976-09-01), Schaefer et al.
patent: 4229067 (1980-10-01), Love
patent: 4310916 (1982-01-01), Dil
patent: 4443700 (1984-04-01), Macedo et al.
patent: 4569038 (1986-02-01), Nagashima et al.
patent: 4581529 (1986-04-01), Gordon
patent: 4706235 (1987-11-01), Melbye
patent: 4769800 (1988-09-01), Moser et al.
patent: 4815064 (1989-03-01), Melbye
patent: 4933537 (1990-06-01), Takahashi et al.
patent: 4994658 (1991-02-01), Takahashi et al.
patent: 5004307 (1991-04-01), Kino et al.
patent: 5031055 (1991-07-01), Yanagisawa
patent: 5096277 (1992-03-01), Kleinerman
patent: 5125750 (1992-06-01), Corle et al.
patent: 5138676 (1992-08-01), Stowe et al.
patent: 5153870 (1992-10-01), Lee et al.
patent: 5193132 (1993-03-01), Uken et al.
patent: 5200867 (1993-04-01), Albrecht et al.
patent: 5212379 (1993-05-01), Nafarrate et al.
patent: 5278812 (1994-01-01), Adar et al.
patent: 5286971 (1994-02-01), Betzig et al.
patent: 5363463 (1994-11-01), Kleinerman
patent: 5406432 (1995-04-01), Murray
patent: 5450203 (1995-09-01), Penkethman
patent: 5490025 (1996-02-01), Dorius et al.
patent: 5493393 (1996-02-01), Beranek et al.
patent: 5497359 (1996-03-01), Mamin et al.
patent: 5499149 (1996-03-01), Dovek
patent: 5504731 (1996-04-01), Lee et al.
patent: 5535189 (1996-07-01), Alon et al.
patent: 5537385 (1996-07-01), Alon et al.
patent: 5566159 (1996-10-01), Shapira
patent: 5568466 (1996-10-01), Komaki et al.
patent: 5574712 (1996-11-01), Alon et al.
patent: 5592444 (1997-01-01), Alon et al.
patent: 5598393 (1997-01-01), Alon et al.
patent: 5625512 (1997-04-01), Smith
patent: 5715226 (1998-02-01), Shimano et al.
patent: 5768056 (1998-06-01), Boutaghou et al.
patent: 5831797 (1998-11-01), Schaenzer et al.
patent: 5841608 (1998-11-01), Kasamatsu et al.
patent: 5870362 (1999-02-01), Boutaghou
patent: 5881042 (1999-03-01), Knight
patent: 5970038 (1999-10-01), Boutaghou et al.
patent: 5986851 (1999-11-01), Angelo et al.
patent: 5991119 (1999-11-01), Boutaghou et al.
patent: 6016239 (2000-01-01), Mizuno et al.
patent: 6023378 (2000-02-01), Schaenzer
patent: 6040958 (2000-03-01), Yamamoto et al.
patent: 6069853 (2000-05-01), Novotny et al.
patent: 2-185729 (1990-07-01), None
patent: 97/14140 (1997-04-01), None
patent: 99/05679 (1999-02-01), None
patent: 99/09547 (1999-02-01), None
Klimowicz William
Seagate Technology LLC
Westman Champlin & Kelly P.A.
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